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RawTherapee 4.0.10 User Manual

1. Black 02 Lightness Contrast t Saturation 076 A A correctly recovered photo the histogram touches both ends As a rule the histogram of a correctly developed image should touch both ends the black and the white end Not doing so means the image was incorrectly developed This is true for the vast majority of photos the only exceptions being photos of scenes which lack dynamic range such as misty scenes If you increase the HRA slider too much then whites turn gray as your histogram no longer touches the maximum end Examples of photos that have been over recovered can be easily found on the internet They look horrible don t do that Recover what you can but what s clipped beyond repair should stay white The histogram of an incorrectly processed photo It should touch both ends instead of having gaps RawTherapee offers more ways to deal with blown highlights The side effect of all these methods is that they also take away some of the brilliance of the photos as they get more or as a result Highlight recovery is very useful when used with moderation but remember that you cannot recover what is not there to begin with so once you notice that the completely clipped white areas become gray you should reduce the recovery amount until these areas become white once more To create the best possible output feed RawTherapee with
2. An overexposed photo No highlight recovery the clouds are clipped RawTherapee 4 0 10 User Manual Page 27 of 94 c RE L A A 4 4 LRLi AANE V Exposure Auto Levels Clip 0 1000 31 Neutral Exposure Compensation 000 Highlight Recovery Amount 02 E Highlight Recovery Threshold 05 Lightness Contrast E I Saturation The Clipped highlight indicator has been turned on to make the clipped areas easier to see By dragging the HRA slider to the right the intensity of the highlights will decrease For highlight recovery to works best you must also enable Highlight Reconstruction Each of the HR methods has its strong and weak points read about them in the Highlight Reconstruction section Color Propagation is the most likely method to produce good looking results when the HRA slider is significantly over 100 For the other methods you will usually want to keep the HRA slider around or below 100 watch the histogram and the preview To find out the optimal HRA value you can make use of the histogram In the screenshots above what you see are overexposed clouds above the Teide volcano in Tenerife When hovering the mouse cursor over the overexposed area th
3. As lenses are optimized to focus visible light of longer wavelengths on the same plane those shorter wavelengths farther away from the ones the lens was optimized for i e purple violet wavelengths on the shorter side of the visible spectrum can visibly tint dark regions when the bright areas are of sufficient intensity This tool should be able to effectively remove most of them Radius Strong chromatic edges are suppressed by averaging over a neighborhood of the specified radius Threshold sets a threshold for the application of defringing Contrast by Detail Levels This filter decreases or increases the local contrast and thus works in two directions either it reduces noise by blurring the image somewhat or it enhances the sharpness impression It uses four sliders Slider 0 Finest has a pixel radius of 1 sliders 1 to 3 have a pixel radius of approximately 2 4 and 8 pixels Contrast and Neutral Use the Contrast button to move all four sliders by preset amounts to the left noise reduction Use the Contrast button to move all four sliders by preset amounts to the right sharpening Use the Neutral button to reset all sliders to 0 Feel free to move individual sliders as well and inspect the results in detail window you may want to zoom in to 200 or more to see better what this filter does For high iso shots 1600 try for example this Click twice on the Contrast button and use USM sharpening with
4. Q A A QA 2 J X The LC curve was used to make the skin tones lighter concealing wrinkles and reducing The model was satisfied with the result a and b Curves The and b curves allow to control output and b channels based on the input a and b channels respectively a f a and b f b As indicated by the color bars the a curve allows one to shift colors between green and magenta and the b curve to shift between blue and yellow This can be used to apply color toning effects RawTherapee 4 0 10 User Manual Page 41 of 94 pt tt a Yt tt ty Yt Senne anan PERTE QQQQm Similar a and b curves were used to warm the image RawTherapee 4 0 10 User Manual Page 42 of 94 H 3 aL Similar and b curves were used to to cool the image B amp W Toning When the B amp W toning checkbox is selected the image s lightness is used for converting it to black and white the effect is the same as setting the Lab Lightness slider to 100 however toning the image using the a and b curves is only possible when this checkbox is enabled Consequently the effect of the following tools gets disabled m Chromaticity slider CC Curve mg LH Curve LC Curve With the B amp W toning checkbox enabled
5. 5 tert 83 5 ING UU UU 84 The Add MOS tatit rene ea ee 84 Use 84 511614 OLS ER m 85 Maximum Number of Threads for Noise 85 S18 8 8 19 TR 85 RawTherapee 4 0 10 User Manual Page 3 of 94 mee T HT a 89 E 89 chers 89 EXAMP EE 89 SNOR 91 6 E TUTUP 94 Bes T UU LITT Pm 94 RawTherapee 4 0 10 User Manual Page 4 of 94 Introduction Welcome Welcome to RawTherapee 4 0 10 the powerful 64 bit open source raw converter for Windows Mac OS X and Linux The RawTherapee project was started in 2004 by the Hungarian programmer Gabor Horvath In January 2010 Gabor decided to open his source code under the GNU General Public License thanks to which talented developers from around the world joined the project Based on their hard work we are proud to present RawTherapee 4 0 10 We hope you will enjoy it RawTherapee 4 0 10 User Manual Page 5 of 94 Features General Features All the standard f
6. Raw 4 0 10 User Manual Downloaded from Google Docs on 2013 03 08 https docs google com document d 1DHLb 6xNQsEInxiuU8pzl sWNinnj09bpBUAA V18w8 edit If you would like to help translate this manual read this forum introductory thread http www rawtherapee com forum viewtopic php f 4 amp t 29431p21647 RawTherapee 4 0 10 User Manual Page 1 of 94 Table of Contents EIST Aa SAE CS ose isa nese ena Onl Exposure and SIA Detal TUTUP Transformation Features Raw Pre Demosaicing TNE RON ENGING seseesa es rr Ia M RIO S Making a Portable IristallallOli c a medidas P FOF LINUX ea TU Uem Using TAY TNS A CC oreesa E a A MOGE ERNEUT m Bab aM Ern LT an FFE VIC 9155 eee ee EDO SUE DANE loner oti ene alee TRG CONS TT onsdows PIghligltssssiseteasesesatcinduiutten
7. processing pipeline The output image will of course be resized Lens Geometry Auto Fill This option will upscale or downscale the photo to the extent that the whole image fits within the image boundaries with no black borders visible When correcting images that suffer from barrel distortion Auto Fill will perform downscaling to fit as much of the reprojected image as possible into the image boundaries so that you dont unnecessarily lose any parts of the image Conversely if the image suffers from pincushion distortion Auto Fill will upscale the corrected image to fill the frame without black borders around the periphery Rotate Rotate the image between 45 and 45 degrees Use the Select Straight Line button to tell RawTherapee what line has to be straight Use the mouse to draw this line Perspective Horizontal When your picture was taken while you were slightly off center of the object you can correct this within certain limits with the horizontal slider Vertical Very useful to correct falling lines eg when photographing architecture Higher values for both sliders produce heavily distortion so use with care Or don t care at all and have fun Lens Correction Profile Select an Adobe LCP file here to automatically correct geometric distortion vignetting and lateral chromatic aberrations It uses its own more precise correction model and is not linked to the other controls However you can still use t
8. Exposure panel Auto Levels The Auto Levels tool analyzes the image and then adjusts the sliders in the Exposure section to achieve a well exposed image Think of the adjustments Auto Levels comes up with as a good starting point In many cases the result should be aesthetically pleasing but as the program doesn t know your taste or expectations this will not always be the case For example you might be going for a low key look in which case you should adjust the values yourself There are also situations in which the algorithm will be fooled and end up setting Exposure Compensation to 10 which will make the whole image white this seems to be the case with photos that consist of large dark areas with a bright area in the center e g photos of the moon In these cases just adjust the settings manually You can reset all of the sliders in the Exposure section by clicking on the Neutral button The Tone Curves will not be touched Clip Auto levels uses the clip value to adjust the exposure This number defines the amount of highlight pixels that may be clipped at the white point and the amount of shadow pixels that may be clipped at the black point The minimum value is 0 0000 maximum value is 0 9999 Higher values increase the contrast Exposure Compensation The values of the Exposure Compensation slider EC are ISO values This means a value of 1 equals one stop of overexposure 1 EV exposure RawTherapee 4 0 10 User Manual Page
9. Here you find the sharpening and noise reduction tools Please note that the effects of some of the filters here are only visible at 100 Use a detail window click on the 4 icon under the preview to inspect a part of the raw or zoom to 100 also called 1 1 by clicking on 4 Sharpening A big warning to start with The Sharpening tool is computed before the Resize tool so if you set a resize value and were planning to adjust a post resize sharpness it will not be possible at the moment But if you resize your image by a factor of 0 5 for example you might want to double your sharpening radius value Unfortunately RawTherapee 4 0 10 User Manual Page 46 of 94 sharpening cannot be previewed at scales lower than 1 1 Sharpening in RawTherapee can be done with two methods using the Unsharp Mask USM or using RL Deconvolution Unsharp Mask Radius The Radius determines the size of the details being amplified and consequently relates to the width of the sharpening halo In general the quality of sharpening 15 best if the sharpening radius is smaller For low ISO images that are in focus and without motion blur a value of 0 5 0 7 is satisfactory Amount The Amount parameter controls the strength of the sharpening Threshold The Threshold tool helps to suppress noise amplification and to confine sharpening to a desired tonal range The Threshold tool allows one to create a curve via which the sharpening is applied The ver
10. RawTherapee 4 0 10 User Manual Page 17 of 94 Background Color of Shortcut Toolbar Buttons Preview Theme 8 based Black 9 White 0 Saving There are several ways of saving an image Preview Behavior amp Crop Visualization Cropped area of the image is masked with theme based color Cropped area visibility is based on crop mask color amp transparency as set in preferences Cropped area of the image is masked with black color Cropped area of the image is masked with white color Click on the little hard disk icon at the bottom left of the preview image or hit the CtrltS shortcut This works as a Save As dialog meaning you can select the name and location for the output file RawTherapee will automatically add the extension based on the chosen format choose a JPEG TIFF or PNG 8 bit or 16 bit for the last two format set compression ratio etc You can also choose to save the processing parameters your adjustments to the three sliders in a sidecar file next to the output image The last option lets you choose whether you want to Save immediately or Put to the head tail of the processing queue Save Immediately If you chose Save immediately RawTherapee will be busy saving your photo as soon as you click OK so it will be less responsive to any adjustments you might try doing while it s busy saving and it will also take longer to open other images as long as it s busy saving this one
11. manual or one of a wide variety of predefined SOUICES Channel Mixer Hue saturation and value HSV and red green and blue RGB curve adjustments Adaptation of the CIECAMO2 color appearance model ratified by the International Commission on Illumination CIE to maintain accurate colors and to given a set of initial viewing condition parameters convert the image so that it will look the same under the target viewing conditions Image processing using CIECAMO2 is enabled a number of methods using curves and sliders A multitude of tools is adapted to auto switch to CIECAMO2 mode when in use including tone mapper sharpening defringe etc Detail Features Sharpening via RL deconvolution and unsharp mask sharpening featuring a unique and powerful threshold slider to bring out detail while avoiding halos Control of sharpening around edges only Microcontrast to bring out texture Contrast by detail levels which decomposes the image into four levels of detail from pixel sized to large radius each of which can be individually tweaked Very powerful wavelet based noise reduction in the RGB and Lab color Spaces Impulse noise reduction to eliminate salt and pepper type noise Defringe tool for elimination of purple fringing Transformation Features RawTherapee 4 0 10 User Manual Page 7 of 94 e Perspective correction e Adobe Lens Correction Profile support for automatic correction of distortion vignetting and chro
12. of lightness RawTherapee 4 0 10 User Manual Page 44 of 94 aje o ee Before 11 o L T E Lightness 02 4 d x E P 1 yA EI 4 E 5 4 j 4 3 poo A msc usa 1 amp f Contrast Ox 4 Saturation 100 5 5 Tone Curve 1 7 v Film like m i Tone Curve 2 Y v Standard e em gt Highlight Reconstruction gt Shadows Highlights gt Tone Mapping Lab CIECAMO2 v Lab Adjustments T Lightness 02 erm pe ees m p Ao t nt Contrast oc q 2 E The B amp W toned image on the left had the Saturation slider set to 100 the one on the right 100 Another method of controlling conversion of color to BW is to use BW toning checkbox and then tweak the RGB Curves or a Channel Mixer to adjust contribution of each of the color channels independently This provides the greatest control for BW conversion RGB versus Lab Many people wonder what the differences are between adjusting lightness contrast and saturation in RGB or lightness contrast and chromaticity in Lab RGB operates in the three channels red green and blue L a b is
13. 10 User Manual Page 76 of 94 Chromatic Aberration This tools corrects bluish green and magenta fringes due to lens lateral chromatic aberration that shows mainly in the borders of the image This correction is performed before actual demosaicing and can sometimes improve the quality of demosaicing step but it is rather slow so its results are shown only when zooming 100 or more Auto Correction If auto correction is checked the Red Blue sliders are disabled and automated detection and correction of chromatic aberration is attempted Red and Blue lf the Red Blue sliders are non zero the given values are used to correct chromatic aberration RawTherapee 4 0 10 User Manual Page of 94 Metadata tab Exif tab Here you can control which Exif metadata will be contained in the saved developed image file The Exif metadata is usually created by the camera itself and implemented into the raw image file Basic Exif informations are directly visible Extended Exif information and so called makernotes are organized into a tree Click on the arrow at the very left of the desired subtree and you ll see its contents Makernotes are informations varying between camera manufacturers and even between camera models You can Remove Keep or Add Edit Exif metadata Manipulating metadata does not change the source file in any way If you want to restore a value you have changed or removed by accident simply press Reset Reset All works simi
14. 26 of 94 value also known as 1 LV light value If you make two photos one without correction EV 0 and one underexposed by one stop EV 1 you can make both photos match by setting exposure compensation for the overexposed photo to 1 or for the underexposed photo to 1 Take a look at the histogram while moving this slider Moving it to the right shifts the whole histogram to the right This means this slider changes the black point on the very left of the histogram and the white point on the very right Highlight Recovery Amount The Highlight Recovery Amount slider HRA can be used to compress the highlights in a photo useful for dimming or burning slightly overexposed areas To see if your photo contains overexposed areas click on the clipped highlight indication icon on the top right of the image window Overexposed areas will show up in black Spoon GAA M M lt lt 99 lt lt 4 28 8 8 DE Toowam Auto Levels Clip 0 1000 Neutral Exposure Compensation 0 002 ul s Highlight Recovery Amount 02 m a a a aaa Highlight Recovery Threshold 05 MLL Black Dia Lightness 05 Contrast 02 Saturation 016 ss
15. 91919 4862 4950 1905 4915 ILLO 4723 902 A936 SLI 9302 9067 5100 5321 5621 5000 93599 4885 5118 5000 OU 5800 6280 5680 9290 4840 5420 4465 5260 D250 2092 2294 Page 54 of 94 CENI 10 049 2030 898 Mos 5 s 994 064 070 i99 190 ALOU 22900 078 S194 060 000 S030 2096 s020 00 5094 XA 076 890 06 1 ES cy aper par qas spo c pes qe es spi per pude eo re dec O or EH qp dp Ee DS RawTherapee 4 0 10 User Manual Temperature and Tint Moving the Temperature slider to the left makes the image cooler bluish moving it to the right makes it warmer yellowish Moving the Tint slider to the left makes the image purplish moving it to the right greenish Vibrance Vibrance is an intelligent saturation adjustment tuned to correlate with the color sensitivity of human vision The vibrance effect is applied with higher accuracy on a correctly white balanced image when RGB saturation and Lab saturation sliders are set to 0 Enabled Vibrance effect can be enabled and disabled without altering other settings of the control Pastel Tones Saturation control over the pastel tones in the image Saturated Tones Saturation control over the saturated tones in the image Pastel Saturated Tones Threshold This threshold setting value is used differentiate between
16. After view to compare your latest change to any previous one Support for processing profiles sidecar files whole and partial Show various channels in the preview red green blue luminosity and a focus mask Show various channels in the histogram red green blue CIELAB luminance chromaticity and raw Clipping indicators in the preview Export Panel with Fast Export Options Keyboard shortcuts to speed up work Command line support to automate RT using scripts or call it from other programs Support for most cameras Sound support to inform you when a CPU intensive task completes e g when the queue is done being processed RawTherapee 4 0 10 User Manual Page 6 of 94 Preserve IPTC of pre tagged files Adapt RT to use your system s interface color scheme and widgets or try the provided custom color schemes Localization in almost 30 different languages Exposure and Color Features The Auto Levels tool tweaks your photos to provide a good starting point Various powerful methods of shadow and highlight recovery Two RGB tone curves featuring four methods each for unprecedented control of colors and exposure Tone mapping based on edge preserving decomposition for a natural look Wealth of Lab adjustments for separate control of colors and luminance Avoid color shift thanks to Munsell correction Preservation of natural skin tones Curve based adjustment of chromaticity and luminance White balance automatic
17. Green channel Blue channel Luminosity which is calculated as 0 299 R 0 587 G 0 114 Focus mask to see which areas are in focus O E h mU d i channel do FY E Sic ef a Tus Regular preview Focus mask RawTherapee 4 0 10 User Manual Page 15 of 94 Preview Mode Shortcut Toolbar Buttons Regular rm gt Red channel r Green channel g anc Blue channel b 2 Luminosity V Sar Focus mask Shift F sooo The preview is returned to normal by deselecting any other mode RGBL preview modes When clipping indicators are engaged in the RGBL preview modes shadow clipped areas are indicated in a blue color and highlight clipping is indicated in red As during normal preview the lightness of the clipping highlight is indicative of the degree of clipping Preview of individual channels may be helpful when editing RGB curves planning black white conversion using the channel mixer evaluating image noise etc Luminosity preview is helpful to instantly view the image in black and white without altering development parameters to see which channel might be clipping or for aesthetic reasons Focus Mask The focus mask is designed to highlight areas of the image which are in focus Naturally focused areas are sharper so the sharp areas are being highlighted
18. RawTherapee 4 0 10 User Manual Page 18 of 94 Put to the Head Tail of the Processing Queue lf you chose Put to head or tail of the processing queue your image will be kept in a queue of files to be processed once activated so RawTherapee can make the most of your CPU and be responsive while you tweak your photos Once youre done tweaking and adding them to the queue you can have RawTherapee start processing the queue while you go and enjoy some tea Whether you save the image immediately or put it to the queue using the Save current image button you can use the proposed output name or set a new one RawTherapee adds the extension automatically based on the chosen output format Note that there is a shortcut for adding an image to the tail of the processing queue at the bottom left of the preview image next to the Save current image button there is a Put current image to processing queue button B It does the same things as clicking on Save current image and then selecting Put to the end of the processing queue and clicking OK except that it will use the file format settings as specified in the Queue tab read about that in the next section The Batch Queue Open a photo for editing tweak it click on Save current image add it to the tail of the processing queue and click OK Go to the Queue tab You will see your photo there waiting to be processed The File format panel resides in the top right side of the Queue tab You can
19. The option Copy IPTC XMP unchanged changes RTs metadata behavior Usually RT will remove all IPTC XMP data from the input image and write only its own tags in IPTC section This may become a problem when you tag your input files using other programs raw usually contain XMP data This would be lost By checking this option RT will not touch IPTC and XMP data at all just passing them through On the downside all your tagging within RT will not be saved though File Browser Tab Image Directory at Startup At the top you can define the Image directory at startup It could be the RawTherapee Installation directory the Last visited directory the Home directory or you define another directory Next you can set some File Browser Thumbnail Options This option defines whether you can see date and time or Exif information below the images in the file browser The Menu Options determine the grouping of the right click context menu in the file browsers You can also define a list of parsed extensions i e which files are recognized as images Some extensions are defined by default Those can be deactivated by removing the checkmark in front of it If a desired extension is missing you can easily RawTherapee 4 0 10 User Manual Page 82 of 94 add it by using the plus button At the bottom of that page there are several Cache options that influence the speed of loading generating the thumbnails These options are quite self explaining The J
20. This curve presents four sliders and three control points The sliders are used to control highlights lights darks and shadows respectively shadows mean deep darks here Move the mouse over the four sliders and a dark area under the curve tells you which slider alters what part of the curve Move the Highlights slider to the left to make highlights less bright move it to the right to make them brighter The Lights slider moves the lights but not the highlights in the same way as above as does the Darks slider moving it to the right lightens the dark tones moving it to the left darkens them The Shadows slider works as the Darks slider but only on the darkest parts of the photo You can again construct the above mentioned stylized S curve although the parametric curve gives you less extreme control over the form of the curve This mode however has its own benefits as curves be shaped in a well controlled manner Note that using these sliders can have a profound influence on the overall contrast of the image Use if needed the three control points under the curve They determine what point of the curve will be affected when moving the sliders Moving the middle control point to the right makes the image darker the form of the curve changes again as does the dark area around the curve moving it to the left makes the image brighter Moving the left control point to the right darkens the dark areas somewhat moving it to the left lightens
21. a conversion of the same information to a lightness component L and two color components a and b The lightness is kept separate from the color so that you can adjust one without changing the other Lightness is designed to approximate human vision which is very sensitive to green but less to blue If you brighten in Lab space it will often look more correct to the eye color wise In general we can say that when using positive values for the saturation slider in Lab space the colors come out more fresh while using the same amount of saturation in RGB makes colors look warmer The difference between the Lightness slider in the Exposure section in RGB space and the Lightness slider in the Lab section is subtle A RGB Lightness setting of 30 produces an image that is overall a bit brighter than when using a 30 Lab Lightness setting The colors in Lab Lightness are somewhat more saturated The contrary is true for the Contrast sliders when using a RGB Contrast of 45 the colors will be clearly warmer than when using a Lab Contrast of 45 The contrast itself is about the same with the two settings Do not hesitate to use both sliders to adjust saturation and or contrast As for the saturation chromaticity sliders setting 100 in RawTherapee 4 0 10 User Manual Page 45 of 94 the RGB Saturation slider renders a black and white image which appears to have red filter applied while the Lab Chromaticity slider renders a more neutral b
22. a photo to it each time a photo is done processing and each time you delete RawTherapee 4 0 10 User Manual Page 20 of 94 a photo from it 8 bit and 16 bit O bit when referring to image formats typically means that the program assigns 8 bits 8 digits or a total of 255 possible decimal values to each pixel s color channel and each pixel in the files RawTherapee saves has three color channels red green and blue Most if not all modern raw capable DSLR cameras use 12 or 14 bit analog to digital converters to record the sensor data This means that when choosing an 8 bit per channel output format in your camera such as JPEG one loses some information Practically this is not a problem when the output file is the definitive one and will not be processed anymore however a photo can be vastly improved when saved as raw data and processed using a state of the art raw processing program such as your s truly RawTherapee Once you have processed a photo in RawTherapee you are faced with the same choice to save the image with a color resolution of 8 bits per channel or 16 bits per channel only TIFF and PNG not JPEG If you plan to post process your photos after RawTherapee in a 16 bit capable image editing program it is better to save it in a lossless 16 bit format Uncompressed TIFF is suggested as an intermediate format as it is quick to save and stores all the metadata Exif IPTC XMP of the original file PNG generally di
23. and Blue Normally you won t see any C A in the preview therefore it is highly recommended to use the Image Details even suggest to magnify to 20096 when you apply this kind of correction As in other software tools this algorithm eliminates moderate chromatic aberration quite well Do not expect miracles with images having extremely high chromatic aberration Vignetting Correction The difference between a cheap telefocus lens and an expensive one is among others that the first one likely will produce vignetting while the expensive lens will not or less Vignetting means light fall off in the corners of the image making them darker than the center This can easily be corrected with this tool Amount Setting the Amount slider to a positive value brightens the four edges of the images to correct the classical vignetting Setting it to a negative value darkens them Radius Influences how much of the image beginning from the edges will be brightened or darkened Lower values area of darkening is bigger higher values area of darkening is smaller Strength Amplifies the settings of the Amount and Radius sliders to the level of an effect filter Set Amount to 100 Radius to 50 and move Strength from 1 to 100 to see how this works Center X Moves the circle of correction to the left or the right of the image Use this to apply vignetting correcting to a cropped photo or to darken an RawTherapee 4 0 10 User Manual Page 65 of 9
24. based on that On Win Vista 7 64bit you can have the language automatically read from the operation system Again a restart is required to change the language of the GUI Default Theme Choose between several themes for the GUI from light to dark The effects are visible after a few seconds so no need to restart here Checking Use System Theme might change the appearance of RawTherapee although this depends on the platform and the window manager in use Just see if it works for you Cut overlay brush this is the color of the area outside of a crop By clicking on the colored button a new window appears where you can also set transparency If set to 75 the cropped area is still somewhat visible Useful to move the crop around and to find the best composition hold the Shift key and move the crop with the mouse Choose the font of your liking here With smaller fonts more tools can be displayed on the screen Clipping Indication When checked the raw photo blinks at underexposed and overexposed areas The both threshold sliders determine at which values blinking begins 0 255 In RawTherapee 4 0 the clipping indicators are calculated on the final image in the output space selected for the image The clipping indicator takes the distance to the maximum minimum and renders these as grayscale values Mention the clipping is only calculated at the end of the processing chain However since RawTherapee 4 0 has a floating point en
25. being edited in an Editor tab the editors values will be reflected in real time in the Batch tool panel editor and vice versa so take care of what you re doing But if you select several images the behavior of each sliders can be used in two different ways The Mode The slider set to work in this mode will change its range and default value right after the image selection in order to add the value of the slider to the value of the according parameter of each image For example if you select two images by holding the Ctrl modifier key one image that has an Exposure compensation of 0 5 EV and another one which has an Exposure compensation of 1 0 EV moving the slider up to 0 3 will result in setting a value of 0 2 EV for the first image and 1 3 EV for the second one This mode may also be understood as Relative mode Using the Reset button will move the slider to its default zero position and will then bring back the initial value of each images for this parameter The Set Mode In this mode the value of the slider will set as is the value of the corresponding parameter If we use the same example as before moving the slider up to 0 3 will result in setting a value of 0 3 EV for both images one value for all images This mode may also be understood as Absolute mode Using the Reset button will move the slider to its default position different for each slider and will then reset this para
26. file over Save processing profile to the cache If you do use the cache keep an eye on it every few months You can share the same cache folder possibly over a network through simultaneous access is not allowed or at your own risk by creating an environment variable see your operating system s documentation on how to create it RT CACHE full path to your cache folder RawTherapee 4 0 10 User Manual Page 10 of 94 Making a Portable Installation RawTherapee and the cache folder can be stored self contained on a USB flash drive or any other mass storage device For Windows You can either download the zipped version of RawTherapee from the download page if available and just unzip it to a target folder or download an installer version and unzip it a command prompt using this command msiexec RawTherapee msi TARGETDIR C TargetDir qb Replace the name of the MSI installer and the target directory as appropriate Spaces in the TargetDir path are allowed as the path is enclosed in quotes Let s assume that you ve unzipped your archive into E RawTherapee where E is the drive letter of your USB flash drive Now open the E RawTherapee options file and set the MultiUser option to false That way the cache directory will be located in a subdirectory of the installation path For Linux Getting RawTherapee to run off a portable medium such as a USB flash drive on various Linux systems is not straightf
27. giving a positive or negative gain The color is converted to its Hue Saturation and Value representation then if the gain is positive the pixel is linearly targeting Value 1 and Saturation 0 the Hue is preserved If the gain is negative the pixel is RawTherapee 4 0 10 User Manual Page 33 of 94 linearly targeting Value 0 Saturation and Hue are preserved Highlight Reconstruction Use this tool to try to restore overexposed highlights It attempts to restore clipped blown out channels in the raw data using nearby data from unclipped channels if present Please note that you need to set Highlight Recovery Amount in the Exposure section to see the effect of the reconstruction Four different methods are available Luminance Recovery When selecting Luminance Recovery recovered details if any will be gray Color Propagation This is the most powerful recovery method In addition to restoring luminosity Color Propagation tries to restore color information by bleeding the surrounding known color into the missing clipped area This method works best on small overexposed areas and can work wonders on overexposed skin Its weakness is that it may sometimes bleed the incorrect colors depending on the image elements surrounding the blown highlights It is also computationally intensive and is therefore slower than the other methods This method has been much improved since version 3 0 and it will render differe
28. not trash can Call up the dialog for file rename If multiple thumbnails selected dialog will be called for each Show trash contents Switch to exposure tab Switch to details tab Switch to color tab Switch to transform tab Switch to raw tab Switch to metadata tab Toggle left panel Toggle right panel Toggle Top panel RawTherapee 4 0 10 User Manual Page 92 of 94 Editor File Browser Editor File Browser Editor Editor File Browser Editor File Browser Editor Tool Panel Tool Panel Tool Panel Tool Panel Ctri Shift L Alt Shift L Ctri Alt L Ctri Shift Alt L Ctrl Q Ctri click on a slider s reset button Ctrl drag curve point Shift drag a curve point Right click over a tool panel title foldable section Windows only shortcuts Mode File Browser Editor File Browser Editor File Browser Editor Shortcut F5 Ctrl F5 Shift F5 Alt Toggle Left and Top panels Toggle Right and Top panels Toggle Left and Right panels Toggle Left Top and Right panels Toggle all peripheral panels maximize main panel Add current image to processing queue The slider is reset to the value it had when the image was loaded in the Editor or when the image was selected in the File Browser The point moves slower than the mouse cursor Allows finer adjustments to the curve The point is snapped to key positions highlighted in red Unfolds clicked
29. pastel and saturation tones to control the area of influence of the saturation sliders for pastel and saturation tones Protect Skin Tones When enabled colors closely resembling natural skin tones are not being affected by the vibrance adjustments Avoid Color Shift When enabled exercises extra control to avoid hue shifting Link Pastel and Saturated Tones When enabled Vibrance level is adjusted with a single slider equally controlling saturation for both pastel and saturated colors Skin Tones Hue According to Hue This H f H curve lets you change the hue of skin tones It behaves just like the tone curve you know from any image editing program but instead of working on a whole color channel it just works on a range of common skin tones The x axis represents the input hue and the y axis the output hue Decide on the specific skin tone hue you want to change the one your subject has in the photo find it on the x axis and then change the curve to map it to a nicer tone on the y axis In practical terms you can use this tool to map a British pink suntan skin color to a nice Maldives brown one RawTherapee 4 0 10 User Manual Page 55 of 94 Before After Vv Vibrance Enabled Pastel Tones Protect skin tones Avoid color shift Link pastel and saturated tones Skin tones HH Y Using the HH curve a pinkish skin hue was changed to a tanned brown o
30. photo is a portrait of a baby You could start off with the Neutral profile and work your way up from there When you are done just click on the Save Current Profile icon in the Processing Profiles panel Enter any name you don t need to specify the extension RT will add it for you But sometimes you ll want to save only a subset of the parameters available e g to avoid storing geometric parameters like rotate crop and resize In this case hold on the Control key while clicking on the Save button When you ll have selected the output file name a window will let you choose which parameters to save You can then share these profiles with your friends or in our forum Remember that in order for a profile to be universally applicable to all photos of the same scene and situation baby profiles in this example you need to think of all the variations in all of the baby portrait photos you might want to apply it to Remember that exposure will vary between shots even if you shot the baby in a studio as the little bugger is likely to be crawling around and even more so if you upload your profile on the internet for other baby photographers with different cameras and different lighting gear to use so instead of setting a specific exposure such as 0 60 you should rather turn on Auto Levels with an appropriate Clip value more on this tool later on This applies to all other settings remember to set just th
31. photos in order to get the same output as originally intended but e g with a new size or output color space using the same version of RawTherapee in which the image was originally edited Whether this is desirable is debatable Consider that you want to squeeze the most out of your raw files possible If a year later you want to go back to an old raw file perhaps getting the same result as you did a year ago is not the best idea because RT s capabilities would have greatly improved in that year and your taste would also have developed Nevertheless by backing up whole cache directories when installing a new major of RawTherapee you can be sure that you can reproduce the exact same result as you achieved years before when you originally developed the photos By default the cache folder is named RawTherapee4 x where 4 represents the major version number and x the minor version number Installation of each RawTherapee version creates a new cache folder to prevent the compatibility problem However if you don t mind re tuning your photos because of backward compatibility problems when upgrading RawTherapee and don t plan on editing your photos with the older version the Save processing profile next to the input file option is the best choice Do note that if you process thousands of photos this cache can grow quite large and possibly slow down RT loading times so this is another argument for choosing Save processing profile next to the input
32. raw The value of this slider represents the multiplier of the RGB channels The correction factor is independent of color space RawTherapee 4 0 10 User Manual Page 68 of 94 Be careful when using it since it is shifts the input before the color management system translates them so you might see color shifts On the other hand reducing the raw white point can recover highlights which would be lost when going through the color management system with ICC profiles White Point Highlight Preserving Correction EV Use this slider to preserve the highlights The value here represents an EV value so the equivalent of a f stop When the correction factor the first slider is positive a high value for the second slider makes highlights somewhat darker thus preserver them On the contrary when the first slider is negative a high value of the second slider makes the highlights lighter This slider only works when the Linear correction factor slider has a value other than 1 0 Black Levels These allow you to add offsets to the channels still in raw that s why there are two greens because a bayer sensor has two green sensors It helps to fine tune color tints in shadow areas Dark Frame In long exposure shots more than 1 sec the non homogeneous thermal noise becomes evident mainly due to unevenness of the sensor and surrounding electronics A method to mitigate this effect is to subtract one or more shots taken in the same conditi
33. screen or on paper Lab Adjustments Technical details of RawTherapee s Vibrance tool in English http acques desmis perso neuf fr RT vibrance2 html RawTherapee 4 0 10 User Manual Page 36 of 94 Additional detailed references in French Lab adjustements and additives vibrance Colorimetry http acques desmis perso neuf fr RT Labadj vibr html http acques desmis perso neuf fr RT ColorRT2 6 html Lab also called CIELAB or L a b is a three dimensional color space designed to approximate human vision as opposed to the RGB color space which models the output of physical devices rather than human visual perception It keeps the tone also called lightness or value separate from the color so that you can adjust one without changing the other The L component closely matches human perception of lightness The a component defines how green magenta the color is The b component defines how yellow blue the color is Lightness When using the Lightness slider in the Lab section a tone curve is applied to the L channel of the Lab color space As with the brightness slider in the Exposure section above the black point and the white point do not move Contrast The contrast slider in Lab increases or decreases the contrast of the photo again applied to the L channel In developer s terms this slider applies a contrast curve centered at the average luminance level Tonalities above the average are lifted lowered while tonalit
34. section and folds all others Action Open result image in default viewer must have been processed before Uses current queue settings to determine output file path Open Explorer in the raw directory and select current image Open Explorer in the queue output directory and select current image if already converted When pressed while working in the Editor tab it temporarily enables both shadow clipping indicators during preview image updates RawTherapee 4 0 10 User Manual Page 93 of 94 Contributors The following people contributed towards this manual Emil Martinec Fabio Suprani Jean Christophe Frisch Maciek Dworak Michael Ezra Oliver Duis Paul Matthijsse Licence Published under the following licence Creative Commons Attribution ShareAlike 3 0 Unported CC BY SA 3 0 http creativecommons org licenses by sa 3 0 RawTherapee 4 0 10 User Manual Page 94 of 94
35. the algorithm that will be used for the corresponding curve Standard This is the most basic mode and the one used in older versions of RawTherapee the values of each channel are modified by the curve in a basic correspondence method The drawback of this mode is that e g considering an S curve shape to get more contrast an orange color with a high value of red and green and a low value of blue will tend to shift toward yellow because the red and green component will be raised while the blue one will be lowered Weighted Standard You can use this method to limit the color shift even if it won t suppress it totally Keeping the previous example this method will raise the first component red and will also linearly alter the green and blue component by raising them too We end up with 3 values R g and b while we have only processed the red component This process is then done for the green and blue component so at the end of the process we end up with 9 values R g b r G b r g B Each values of the same component are then mixed together which will produce the resulting color with a smaller color shift Film Like Basically it uses Adobe s method from their reference sample code It is the same method that is used by the DCP s tone curve Saturation and Value Blending This method is better suited for high key shots The average value of the three component is computed and then the curve is applied to this value
36. the best possible input so expose well in the first place RawTherapee 4 0 10 User Manual Page 29 of 94 Highlight Recovery Threshold The Highlight Recovery Threshold slider sets the point where the HRA slider starts implementing compression A value of 0 means the threshold is zero data compression occurs over the whole range of tonalities 100 sets the threshold at one stop below the white point so all the compressed highlights are squeezed into the top stop In practical terms more highlights are recovered when this slider is set to Black Use this to set the black point See the left side of the histogram move when you touch the slider Values greater than O will make the image darker negative values will lighten up the shadow parts of the photo Shadow Recovery The Shadow Recovery slider dampens the effect of the Black slider the maximum value of 100 gives a less dark image This slider has only effect when the Black slider is set to another value than Practical use of the Shadow Recovery slider is to fine tune the shadow intensity of the image Lightness This slider applies a fixed tone curve to lift or lower the tonalities of the photo resulting in a more or less bright image The same tone curve is applied separately to each R G and B channel The black point and the white point keep their positions Contrast This slider increases or reduces the contrast of the photo It applies a contrast curve centered at
37. them again somewhat Moving the right control point to the right makes the highlights brighter moving it to the left darkens the highlights Use the Reset to default buttons next to the sliders to reset individual sliders use the same button at the top of the tone curve section to reset all four sliders and the control points to linear zero Control Cage At first sight this curve type looks very much like the Custom curve but there RawTherapee 4 0 10 User Manual Page 32 of 94 are some differences though With the Custom curve the curve touches all the control points This is not the case with the control cage curve To see this click somewhere on the line and move the black point to the left or to the right Now the curve passes nearby the black point but doesn t touch it Another difference is that the ontrol cage allows for a straight section of the curve while you can t do this with the custom curve The cage curve needs at least three points for that so five in total Holding down the Shift key while dragging a point will help you to easily create a straight line by snapping the point to the line made by the previous and next point displayed in red by the snap to tool Now make a new point between the two most left ones and move it As you can see only the part on the left side moves not the rest of the curve Curve Mode Next to each curve type you ll find a Curve Mode combobox selector This will let you choose
38. threshold parameter and has a high impact on the visual quality For low ISO low noise images use 1000 or less for high ISO images use 2500 3000 or even more Halo Control Halo Control is used to avoid halo effects around light objects when sharpening too aggressively When activated a new slider appears Amount At 100 it works at maximum reducing the visual impact of the USM filter RL Deconvolution The second sharpening method is RL Deconvolution named after the makers of this algorithm Richardson and Lucy Here it is assumed that the image suffers from a Gaussian blur like when applying a Gaussian filter which might be produced by the lens motion etc In reality the blur might come close to a Gaussian blur but not exactly Therefore some artifacts like halos might occur when you try to remove the Gaussian blur Edges Radius and Amount You can define the Radius of the gaussian blur you want to remove When you set the Amount to 100 the gaussian blur will be removed completely but as this gives a harsh result a lower setting is recommended Damping and lterations The Damping is used to avoid sharpening of noise on smooth areas As deconvolution cannot be done perfectly at the first time several Iterations are necessary How much is changed between each iteration is defined by the Richardson Lucy algorithm The more iterations are used the more perfectly the gaussian blur is removed but with each iteration the speed de
39. vng4 False Color Suppression Steps 0 2 Qu Preprocessing Line Noise Filter 02 Green 02 Hot Dead pixel filter b Raw White amp Black Points b Dark Frame A good image to test the demosaicing algorithms on Zoomed in to 80096 you can clearly see that VNG4 is not a good choice for this Pentax K10D raw file as there are dots where there should be none and the detail of the wall s brickwork the orange part on the right is all washed out Preprocessing Line Noise Filter This filters pattern noise The slider sets the strength of the effect Green Equilibration Some cameras for example Olympus Panasonic Canon 70 use slightly different green filters in the two green channels of the color filter array on the camera sensor Green equilibration suppresses interpolation artifacts that can result from using demosaic algorithms which assume identical filter properties in the two green channels The threshold sets the percentage difference below which neighboring green values are equilibrated Apply Hot Dead Pixel Filter Suppresses hot and dead pixels by replacing them by a neighborhood average Raw White amp Black Points White Point Linear Correction Factor Applies a linear exposure correction on the raw file before the demosaic algorithm is used This can be useful to deal with difficult lighting situations that resulted in overexposed areas in the
40. will stay pressed or stay released after each click on it Toggling on off the curve s button will respectively display hide its associated editor This is very handy and saves a lot of space when handling groups of curves e g see the Lab curve editor The Reset button will reset the displayed or pressed button curve only For the Parametric curve type clicking the right mouse button over the zone selector will reset the handles position to their default values the global reset button will reset them too Warning resetting the curve is considered as a curve modification so if you ve just modified the curve and mistakenly pressed the Reset button there s no way to bring back your curve Ctrl Z will go one step before in the History list not in the curve s RawTherapee 4 0 10 User Manual Page 25 of 94 edition The Preview Area The preview is designed to show you the most realistic result possible but it still has to deal with the quality speed balance That s why some tools will only be computed and previewed at the 1 1 10096 scale This applies to all tools in the Detail tab For example it wouldn t really make sense to show the effects of the Sharpening tool when you are not at a 1 1 zoom level as the effects would be indiscernible when zoomed out and would just waste a few seconds of CPU time delaying the appearance of the effects of other tools which do make a big difference when zoomed out Exposure Tab
41. you can tone the image by tweaking the a and b curves e g to introduce a sepia color cast RawTherapee 4 0 10 User Manual Page 43 of 94 2 5 7 s vs ORS 1 1 n 7897 tele 7 a di Saal oorkm Re t z pq Y v v 7 v ef sr To copy color toning from one image to another copy the current processing profile to clipboard then partial paste it either by right clicking a photo in the File Browser and selecting Processing Profile Operations gt Paste partial or from the Image Editor tab by Ctrl clicking on paste profile from clipboard to paste only the Lab Adjustments section of the profile Please note that other adjustments in the Lab Adjustments sections will be pasted as well Alternatively the a and b curves can be copied and pasted individually Controlling Conversion to B amp W The interpretation of the image lightness according to color can also be controlled via the Saturation slider in the Exposure section Use of this slider alters brightness of colors at various degree Since the saturation adjustment is applied prior the Lab adjustments this leads to a color dependent change
42. 00 10 00 00 00 05 00 0200 0 0 476 icm Under Windows XP the path differs C Documents and Settings lt your username gt Local Settings NTempNNkn random SIE TINO tmb 3 Under Picture Control click on the Launch Utility button While the utility is running the profiles will temporarily appear in the folders listed above They appear there because Nikon applies generic profiles to your pictures These are named picture control settings For example Capture NX 2 has neutral standard and monochrome profiles For use with RT you must simply know that Nikon generates different ICM profiles with every different setting To ease the choices the neutral standard landscape settings seem to be similar apart from the increased saturation and contrast You should be able to tune the tone curves in RT so in general a single neutral profile should be good starting point WARNINGS other settings may also generate new ICM files You must be particularly aware that pictures shot under artificial lighting will have different profiles and using such profiles with daylight shots will result in color casts D lighting dramatically changes contrast If in doubt open your particular image you want the color profile for and use that profile in RT In most cases a generic color profile will be sufficient RawTherapee 4 0 10 User Manual Page 8 of 94 Command Line Options Usage rawtherapee lt selected dir gt Start
43. 00K amp Cloudy Camera specific o Canon 6000 o Leica 6400K o Minolta 6500K o Nikon 6000K o Olympus 6000K o Panasonic 6200K Camera specific o Canon 7000 Leica 7500 RawTherapee 4 0 10 User Manual Page 52 of 94 o Minolta 7500 o Nikon 8000K o Olympus 7500 o Panasonic 7500K 28 Tungsten 2856K e Fluorescent o F1 Daylight 6430K o F2 Cool White 4230K o F3White 3450K o F4 Warm White 2940K o F5 Daylight 6350K o Lite White 4150K o F7 D65 Daylight simulator 6500K o F8 050 simulator Sylvania F40 Design 5020 9 Cool White Deluxe 4150K o F10 Philips TL85 5000 o F11 Philips TL84 4150K o F12 Philips TL83 3000K Lamp o HMI lamp studio Osram for film spectacles studio etc 4800K GTI lamp Graphiclite amp ColorMatch for Photography 5000K o Judgelll lamp D50 5100K o Solux lamp 3500K o Solux lamp 4100K Solux lamp near daylight e g in Musee d Orsay 4700K o Soluxlamp near daylight e g in the National Gallery 4400K e LED LSI Lumelex 2040 e g in the National Gallery 3000K o CRS SP12 WWMR16 e g in the National Gallery 3050K e 4 Flash o Daylight Leica 5500K o Daylight Canon Olympus Pentax standard 6000K o Daylight Minolta Nikon Panasonic Sony 6500K ICC DCP Specific Daylight White Balance Values The daylight white balance temperature values used by your camera and commonly referred to in literat
44. 15 to alter image luminosity by changing the contribution of the RGB channels to it while keeping image color the same The effect is somewhat similar to V changes in the HSV Equalizer but is smoother and broader across hues not as selective When working on black and white images similar adjustments could be made via the Channel Mixer but RGB Curves allows a finer control Color Management Profile types RawTherapee supports the following types of color profiles Type Color fidelity speed Adobe DCP below version Best color fidelity not restrictions Fast 4 RawTherapee auto matched profile Adobe DCP version 4 Not supported too bright and not needed RT does not have the problems which v4 aimed to solve ICC LUT based Highlights clipped default or inaccurate using Blend with Matri option Blend with Matrix only usable if profile rendering is similar to RawTherapee internal default matrix e g not with indoor profiles Slow ICC CaptureOne Supported like ICC LUT based however colors are not guaranteed to be exactly like CaptureOne Slow ICC Nikon NX2 hacked Highlights clipped and not recoverable Colors are not from temporary directory guaranteed to be like NX2 but very near Slow See chapter titled How to Obtain Nikon Profiles from NX2 ICC Matrix based Color fidelity reduced in comparison to the other types but RawTherapee Camera no highlight restrictions Fast Default Input Profile N
45. 4 area on the left or the right that is a bit overexposed think flash Center Y Moves the circle of correction up or down over the image Useful to burn skies or lighten the foreground RawTherapee 4 0 10 User Manual Page 66 of 94 Raw Tab Demosaicing Method To display a raw file any raw file made by any camera its data has to be demosaiced That s why opening a raw file always takes a bit longer than opening a JPEG or TIFF file where the data is already display ready RawTherapee offers several demosaic algorithms each with its own characteristics The differences between them are often very subtle one might need to zoom in to 200 400 to discern them but since the program works on a pixel by pixel basis and demosaicing is the basis upon which all other tools work the choice of demosaicing algorithm can have a visually significant effect when combined with other tools such as the sharpening ones The choice of a certain algorithm influences among other things the quality of very fine details in the image whether false maze patterns will appear and decides how well colored edges are rendered RawTherapee uses the Fast algorithm to initially open the image for editing After this the selected demosaic method is applied when the image is zoomed to 100 magnification or when the detail window is opened The selected method is also used for batch processing It is not recommended to select the Fast method for t
46. File Browser tab is replaced with what you see in the preview in the Editor tab and every tweak you make is reflected in the thumbnail The thumbnails get stored in the cache for quick future access All subsequent times you open a previously edited folder RawTherapee will read the thumbnails from the cache if they exist and this will be much faster than the first time you opened that folder Use the zoom icons on top of the file browser to make the thumbnails smaller or bigger Each thumbnail uses some memory so it is advisable to keep the thumbnail size low Preferences gt File Browser gt Maximal Thumbnail Height You can filter the photos visible by using the buttons in the top toolbar as well as by using the Find box or the Filter tab Possible uses Show only unedited photos RawTherapee 4 0 10 User Manual Page 12 of 94 e Show only photos ranked as 5 star e Show only photos with a specific ISO range e Show only photos with a NEF extension Editor Tab Modes Double click on one of the photos in the File Browser tab It will open in a new tab the Editor tab RawTherapee allows you to work on photos in two modes e Single Editor Tab Mode where you work only on one photo at a time and each photo is opened in the same Editor tab There is a horizontal panel called the filmstrip at the top of the Editor tab showing the rest of the photos in that folder for easy access e Multiple Editor Tabs Mode where each
47. IT ANON 77 Meada Scl EE TET TT 18 M M RE RS SN 78 Auge wieder 78 Preferences VVIBQOOW E uten temi hat nl 80 General TAD 80 PA SLOT 80 STAI EAN UAC NEUE LL 80 BIS ESI 80 CODING RTT TD TT 80 DIC FO NENNEN CIT 81 External exo 81 Prole BN CCM M EROR 81 POO 81 image PIOCESSING TAD ELE 81 Default Image Processing 81 Processing Proe ceeded ent 81 Cen 82 9 E 82 UTE 82 FIle Browser E 02 image DIFECIONY E iucrjublom 82 Color Management ge 83 PM 83 PRC 83 BHU A ee ise scree ata E 83 Absolute
48. Middle gsRGB similar to AdobeRGB1998 with gamma close to SRGB g 2 40 slope 12 92 m HT Large gsRGB similar to ProPhoto with gamma close to sRGB 9 2 40 slope 12 92 close to Melissa used by Lightroom m Large gBT709 similar to ProPhoto with gamma BT709 g 2 22 slop 4 5 m Large 910 similar to ProPhoto with linear gammma g 1 0 slope 0 RawTherapee 4 0 10 User Manual Page 61 of 94 The recommended output profile in most cases is RT RT sRGB is a higher quality version of the standard sRGB profile which surprisingly is not consistent between implementations RT sRGB was custom made for RawTherapee by Jacques Desmis and has 4096 LUT points as opposed to the lower quality 1024 point 5 profiles Applications that aren t color managed and won t take advantage of RT sRGB will fall back on SRGB RawTherapee 4 0 10 User Manual Page 62 of 94 Transform tab Crop Quite self explanatory Use the Select crop button to drag a crop with your mouse Use the Shift key to move the crop over the image Resize a crop by placing the mouse on one of the sides cursor changes into a double arrow Click inside of the crop to show temporarily the whole image Go to the Preferences window tab General and click on Cut overlay brush to change the color and or transparency of the area around the crop Use Fix ratio to set the crop to a fixed size like 3 2 16 9 etc 1 1 is for square crops DIN means paper sizes like A4 and A5 those
49. PG option is usually the fastest and uses the least disk space however the thumbnail quality is the least Color Management Tab Here you can define the directory where ICC profiles could be found You should also define the ICC profile of your monitor when you ve done a calibration If you don t do it the image will be displayed with wrong colors The option Automatically use operation systems main monitor profile is currently only supported on Windows Please mention that RT only knows about one monitor So if you have multiple monitors connected it will always take the main monitors profile the one with the task bar You can also set the colorimetric intent which defines how the ICC profiles are used for translation between gamuts or color spaces Perceptual If the color gamut of your image is higher than that one your device monitor or printer is able of then it is compressed a bit to fit the gamut of your device as far as possible This might result in an image with reduced saturation the hue is still kept It might look a bit dull But this is not really that much visible as the color relations stay the same This method 15 activated by default recommended Relative Colorimetric The colors existing in the color gamuts of both your image and your device are kept and displayed 100 perfect If the color does not exist within the color gamut of your device the nearest possible value is taken This might lead to some banding
50. RT GUI browser inside dir rawtherapee lt file gt Start GUI editor with file rawtherapee c lt folder gt lt files gt Convert files in batch with default parameters Options used with c must be last option rawtherapes o output O output Iesp sL lt 21 tem ou lt file gt lt dir gt Select output file or directory lt file gt lt dir gt Select output file or directory and copy into it 5 Include the file next to the input file with same to build the image s parameters e g for photo raw there should be a photo raw pp3 file in the same directory If the file does not exist internal default values not those in Default pp3 will be used 5 Like s but skip if the PP3 file does not exist lt file pp3 gt Specify PP3 file to be used for all conversions You can specify many p options as you like see below d Use the default raw or non raw PP3 file as set in Preferences Image Processing Default Image Processing Parameters j 1 100 opecify output to be JPEG on by default Optionally add compression 1 100 Specify output to be uncompressed 16 bit TIFF t1 Specify output to be compressed 16 bit TIFF ZIP compression n Specify output to be compressed 16 bit PNG Y Overwrite output if present Your PP3 files can be incomplete RawTherapee will set the values as follows 1 A new profile is created usin
51. The focus mask is more accurate on images with a shallow depth of field low noise and at higher zoom levels To improve detection accuracy for noisy images evaluate at smaller zoom around the 10 30 range Note that the preview is rendered more slowly when the focus mask is enabled RawTherapee 4 0 10 User Manual Page 16 of 94 Focus mask indicating the focusing plane The current implementation analyzes the preview image which is rescaled from the original captured size This process of rescaling reduces the noise and is helpful to identify truly sharper details rather than noise itself which may also contain micro texture At the same time rescaling of the original image to the preview size compresses larger scale details into a smaller size and it may introduce aliasing artifacts both of which could lead to false positives You can increase your confidence by viewing the mask at various zoom levels It is not always fault proof but can be helpful in many cases Warning Be sure to double check your images if you decide to delete them based on the focus mask Background Color of the Editor Preview The background color of the preview panel surrounding the image area may be changed to ease image preview during editing and to better visualize image cropping A vertical stack of three thin buttons in the preview modes toolbar above the image preview panel allows to set the background color of the area around the photo preview
52. alues possible also help to smooth color transitions to prevent color banding The downside is the RAM space floating point numbers require which is exactly twice that of 16 bit integer To cope with these increased requirements a 64 bit operating system is highly advised for stability If you have problems running RT on a 32 bit system try the following e Asa general rule you should avoid having folders with too many raw photos in them as each photo takes up memory when displayed in RawTherapee s File Browser tab Try not to have more than 100 photos per folder e Use 4 Gigabyte Tuning in Windows See the page in the Microsoft Library for an explanation of what 4 Gigabyte Tuning is http msdn microsoft com en us library bb6134 73 28VS 85 29 aspx and find out how to do it in Windows XP Vista and 7 by reading this guide http avatechsupport blogspot co uk 2008 03 how to set 3gb startup switch in html RawTherapee 4 0 10 User Manual Page 8 of 94 Close other programs while working in RawTherapee Close the image editor tab when you re done editing to free up memory Turn off auto start in the batch queue Only add photos to the batch queue once you are done editing all of them and then start it Use the batch queue do not use the immediate save button Change to a directory with few or no photos in it before starting the batch queue The most memory intensive tools are Tone Mapping High Quality Shadows amp Highlights and Contras
53. an amount of 80 Threshold The Threshold parameter is used to prevent the sharpening of noise if a pixel luminance differs only a bit from its neighbors the difference is less than the threshold then it is not sharpened You can set the threshold also to O but then everything will be sharpened even the noise RawTherapee 4 0 10 User Manual Page 51 of 94 White Balance Method White balance can be set in different ways Camera Auto Custom or a host of presets for different light sources Camera Takes the white balance used by the camera If you shoot only in raw so no put the white balance settings of your camera Auto This should generally give good results Auto Automatically corrects the white balance Custom set your own color temperature and green tint by moving the two sliders and or using the Spot WB tool Light source presets Daylight Sunny These temperatures correspond to the daylight setting temperature used in these camera manufacturers cameras they will be referred to as camera specific temperatures in this manual not to the actual daylight temperatures as calculated from the ICC or DCP profiles these will be referred to as ICC DCP specific When available use the more precise ICC DCP specific daylight temperature and tint values o Canon 5200K o Leica 5400K o Minolta 5100K o Nikon 5200K o Olympus 5300 o Panasonic 55
54. and you get the maximum number of threads it would make sense to run simultaneously Let s call this number T max You would not benefit from running more threads than this in fact you would likely suffer a small speed penalty Setting this parameter to 0 will let your CPU figure out what Tmax is and use that If you experience crashes due to insufficient RAM then you can calculate Tmax yourself and use a number lower than that Sounds Tab Here you can get notified with a sound when a lengthy operation has ended It is currently only supported on Windows and Linux The Queue processing done sound is played after the last queue entry finished processing The Editor processing done sound is played after a lengthy in editor operation that took longer than the specified number of seconds is complete sounds can be muted either by enabling the mute option or by setting fields with sound file references to blank values The Queue and Editor processing done text boxes can either point to wave wav files or can specify one of the following values RawTherapee 4 0 10 User Manual Page 85 of 94 Windows Linux SystemAsterisk SystemDefault SystemExclamation SystemExit SystemHand SystemQuestion SystemStart SystemWelcome bell camera shutter complete dialog warning dialog information message service login service logout suspend error trash empty possibly the name of any file in usr share sounds f
55. ane01 The processing profile will be built as follows 1 A new profile is created using internal default values hard coded into RawTherapee 2 then overridden by those from the default raw profile d then overridden by those found in iptc pp3 4 then overridden by those found in the sidecar file s if it exists so you can force some IPTC tags even if already set by iptc pp3 5 then overridden by those found in exif pp3 so you can force the profile to erase some tags 6 then overridden by those found in web pp3 to resize and sharpen the image and make sure that the output colorspace is SRGB Q9 As you see the position of the s switch tells when to load the sidecar profile relative to the other p parameters That is not the case for the d switch Example 3 In the third example we will see how long it takes to process every raw file in a directory assuming that each raw photo has a corresponding processing profile time Tor fin home user photos 201LI IT 7LI rawz do RawTherapee 4 0 10 User Manual Page 89 of 94 rawtherapee o dev null S t Y c f done RawTherapee 4 0 10 User Manual Page 90 of 94 Shortcuts Mode Any Any Any Any Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Editor Shortcut Ctri F2 Ctrl F3 C
56. asing large scale contrasts while preserving or boosting small scale contrasts The method used is taken from Edge Preserving Decompositions for Tone and Detail Manipulation with some modifications Note tone mapping requires a lot of memory RAM and is CPU intensive RawTherapee 4 0 10 User Manual Page 35 of 94 Strength This controls the strength of the overall effect Edge Stopping This parameter affects sensitivity to edges the greater it is the more likely an illumination change is to be considered an edge if set to zero tone mapping will have an effect similar to unsharp masking Scale This control gives meaning to the difference between local and global contrast the greater it is the larger a detail needs to be in order to be boosted Reweighting Iterates In some cases tone mapping may result in a cartoonish appearance and in some rare cases soft but wide halos may appear Increasing the number of reweighting iterates will help fight some of these problems When more than zero reweighting iterates are used the best results will be had if the edge stopping parameter is set to one technical detail this results in a 1 norm approximation of the smoothness using iteratively reweighted least squares Before After z M T Tone mapping was used on this high 3 32 bit TIFF i image to make it look aesthetically pleasing and viewable on low dynamic range media such as a computer
57. asting it to different images will result in independent auto selection of the appropriate flat field for each of them RawTherapee 4 0 10 User Manual Page 75 of 94 RawTherapee 4 0 2 17 Mamiya 20 Unknown r 2 8 1 100 15090 8Omm S Imaging Settings FlatFields MamiyazD 80 0 mm f 2 8 20110130 MEF Memosaicimg all Navigator Preprocessing Raw white black point Dark Frame Flat Field Chromatic Aberration RawTherapee 40217 Mamiya ZD Unknown r 2 8 1 100 15050 BOmm Exposure Detail C 5 Imaging Settings FlatFields MamiyazD 80 0 mm f 2 8 20110130 Demosaicing all Navigator Preprocessing Raw white black point Dark Frame Flat Field Chromatic Aberration zs X iL in Ready Hb Demonstration of the effects of flat field removal from the flat field photo itself The figure above illustrates the application of a flat field file onto itself There is a noticeable asymmetry shown in before image on top in the light falloff as well as in the green color cast Flat field correction removes both color and luminance non uniformities and results in a perfectly uniform image Histogram on the bottom after image indicates that corrected image does not have any variation in the tones exactly what one would expect from a uniform flat field The same level of correction is applied to the real image when it is flat field corrected RawTherapee 4 0
58. creases and the danger of halo artifacts rises Normally you don t want to remove the gaussian blur perfectly due to personal visual taste and speed The default settings should be fine most of the time Most sharpening algorithms work by making use of a trick our brain plays on us whereby an image with a high acutance edge contrast appears sharper than one of the same resolution with a lower acutance At these high contrast edges the brain fools us into thinking the edge is sharper than it really is an optical illusion known as Mach bands This is the phenomenon on which Unsharp Masking is based This is not how Edges works RawTherapee 4 0 10 User Manual Page 48 of 94 Edges is a true sharpening algorithm It does not introduce halos it can be used to some degree on noisy images and it works in the Lab space Zoom in to 100 and enable it you will see how it sharpens edges and only edges More information here http www rawness es sharpening lang en Note that excessive application of this tool may lead to posterization of the image Microcontrast This tool complements the Edges tool Where Edges sharpens just the edges Microcontrast can be used to enhance texture 3x3 matrix is better suitable for noisier images Impulse Noise Reduction ouppresses salt and pepper noise usually white single pixel noise similar but not occurring for the same reason as hot or dead pixels The slider adjusts the threshold that
59. d be fine 6 Now increase the Luminance Detail slider to recover detail until you are happy with the noise detail trade off Luminance RawTherapee 4 0 10 User Manual Page 49 of 94 This slider lets you control coarse smoothing of luminance Luminance Detail This slider is for detail recovery after application of the Luminance noise reduction Chrominance Master Applies noise reduction to color channels If this slider is at 10 the Delta sliders have no effect Delta Chrominance Red Reduce or boost the effect of color noise reduction in the red channel Delta Chrominance Blue Reduce or boost the effect of color noise reduction in the red channel Gamma Gamma varies noise reduction strength across the range of tones Smaller gamma values let noise reduction affect all tones emphasizing the action on shadows while higher gamma values limit the effect to brighter tones only Before m After MEME in te 45 al Defringe Purple fringes are a form of axial or longitudinal chromatic aberration and appear along dark edges adjacent to bright areas due to incorrect focus lens imperfections or simply but more technically due to the nature of lenses not focusing all colors on the same plane RawTherapee 4 0 10 User Manual Page 50 of 94
60. de Green Toggle Preview mode Blue RawTherapee 4 0 10 User Manual Page 91 of 94 Editor Editor File Browser File Browser File Browser File Browser File Browser File Browser File Browser File Browser File Browser File Browser File Browser File Browser File Browser File Browser Editor File Browser Editor File Browser Editor File Browser Editor File Browser Editor Editor File Browser Editor File Browser Editor Editor V Shift F Ld 1 through 5 6 7 Alt Alt 1 through 5 Alt 6 Alt 7 Ctrl F D F2 T Alt E Alt D Alt C Alt T Alt R Alt M Ctri L orL Alt L Shit L Toggle Preview mode Luminosity Toggle Preview mode Focus mask Show only images without a rating Show only images with specific rating Show only not edited images Show only edited images Show only images without color label Show only images with specific color label Show only images that were not recently saved Show only images that were recently saved Sets focus to Browse path selects contents Browse Path shortcuts user s home directory user s picture directory Press Enter to refresh Press Ctrl Enter to reload Sets focus to the Find box selects contents Press Enter to execute search comma separated values list is supported Press Escape to clear the Find box Clear all filters ratings color labels edited not saved
61. e and the date of the flat field file If match is found the file name of the selected flat field image will be displayed along with its aperture setting If match is not found flat field correction will not be applied and message will be displayed to the user If more than one exactly matching flat fields are found their data will be averaged and then used for flat field correction Flat Field RawTherapee 4 0 10 User Manual Page 73 of 94 Auto selection does not account for the tilt shift settings used on the lens therefore such flat fields should not be stored in the main flat fields directory but rather in a descriptively named subdirectory Such unusual flat field files should be applied manually Flat Field File Browser Context Menu Options You can apply and manage flat field images from within the File Browser tab by right clicking on a thumbnail and selecting the Flat Field option You will be presented with three sub options i Select flat field brings up the file selection dialog to select a flat field file to be applied to the selected images ii Auto Flat Field allows to run the Auto Select option on the currently selected images iii Move to flat fields directory moves the selected image into the directory specified in the preferences MamiyazD 3 5 1 100 Flat field Move to flat fields directory Blur Type Blur Type Purpose A default and generally most useful setting to apply blur action Area equally i
62. e bare minimum number of options to achieve the effect you want Leave the rest untouched as it is very likely that if you had set those other options they will not apply well to other photos If your processing profile is meant to make baby face photos look soft and cuddly by a clever mixture of highlight recovery auto exposure Lab and RGB tone curves then don t enable noise reduction don t set custom white balance don t rotate the photo and so forth All these superfluous parameters are likely to change between photos and not influence your soft baby look in any way so turning them on will just litter your profile Double check these things before sharing your profiles Closing RawTherapee To close RawTherapee click on the little close icon on top of the window Its location depends on your window manager if this icon is located on the right or the left of your screen and if it s colored or just shows There s official exit button so simply close the RawTherapee window Edit Current Image in External Editor You can use the Edit current image in external editor button 8 located at the bottom left of the preview panel to process your raw in RawTherapee and send it straight to an image editor such as Gimp or Photoshop for further processing Note that RawTherapee produces 16 bit temporary intermediate files when using this button but Gimp cannot yet handle 16 RawTherapee 4 0 10 User Manual Page 23 of 94 bit image
63. e pixel values indicator in the Navigator panel under the little preview shows that lightness L is at 100 and the histogram shows that all channels are clipped see the red green and blue squares in the top right corner of the histogram they mean that there are so many pixels of maximum value that they are off scale Increase the HRA slider until the red green and blue channels in the histogram no longer squash up against the right end of the histogram you want them to touch it but not to cram up against it You can enable the Clipped highlight indication icon A before moving the HRA slider up Once the indicator s black areas disappear from the white parts you want recovered which is also when the lightness of those pixels drops from L 100 to L 99 you stop Don t increase the HRA slider any more because now the hopelessly lost white areas would start turning gray You don t want them to turn gray That would make the photo look dull In this example the indicator s black areas disappeared when set HRA to 125 RawTherapee 4 0 10 User Manual Page 28 of 94 E FB J ER d4 1i Before After ee ee ee ea ee Feomzm v Exposure AutoLevels Clip 0 1000 4 Neutral T ca Exposure Compensation 000 Highlight Recovery Amount 1252 Highlight Recovery Threshold Cs
64. e shadow areas more Tonal Width for Shadows This slider controls the strength of the Shadows slider A maximum value of 100 gives the strongest shadows effect Local Contrast Local Contrast is an adaptive contrast adjustment depending on contrast within a specified area It increases contrast in small areas while keeping the global contrast which can be set with the contrast sliders in Exposure or Lab The resulting image will look more three dimensional This feature is very useful when you have a foggy image or took your picture through a window The effect is somewhat similar to an unsharp mask with a high radius and a small value A setting between 5 and 20 works best for most shots Radius The value of the Radius slider influences the Highlights Shadows and Local Contrast sliders The larger the radius the stronger the effect of local contrast The effective area of the Highlights and Shadows sliders also increases If you are bored set the first four sliders to 100 and play with Local Contrast to transform your favorite raw processor into a cheap effect machine Tone Mapping The Tone Mapping tool can be used to lift the dark areas of your photo in a way that prevents halos from appearing and it can be used to bring out or suppress detail to make the photo more crisp or more dreamy Tone mapping adjusts the global contrast of an image differently from the local contrast Specifically it s very useful for decre
65. eatures you would expect from a raw developer and much more A processing queue to make tweaking a photo as fast as possible while leaving the CPU grunt work queued up for later Floating point engine the only raw developer on the market which does all calculations in precise floating point notation so nothing gets rounded off and lost SSE optimisations for better performance on modern CPUs Color management using the LCMS2 color management system for more precise color handling providing control over working and output color space File browser featuring colored tagging searching by text matched to the filename metadata filtering by file camera model lens model photo parameters Support for DCP and ICC color profiles for precise colors or for replicating the camera look to match out of camera JPEG images A history panel to easily see what changes you made and jump back to a specific point A snapshot panel to work with multiple versions of changes to a photo A flexible UI where panels and some individual elements can be adapted hidden Easily pan around photos much larger than your screen thanks to pan rate amplification eliminating the need for numerous and fidgety mouse movements scroll the tool panels using your mouse scroll wheel without worrying about accidentally misadjusting any tools or hold the Shift key while using the mouse scroll wheel to manipulate the adjuster the cursor is hovering over A Before
66. effects especially visible in blue sky The white point will be corrected Saturation Very similar to Perceptual but here it is tried to keep the saturation and change the hue instead This is very useful for e g screenshots or similar It could also be used when you do not care of some possible color shift as long the image does not look dull Absolute Colorimetric Similar to Relative Colorimetric It tries to reproduce the exact colors recorded in the original scene The white point will not be corrected It is normally used when the gamuts of your image and your device are nearly the same For example for reproduction of specific colors like reproductions of fabric or logo colors RawTherapee 4 0 10 User Manual Page 83 of 94 Batch Processing Tab The Batch processing is the capability of editing several images at the same time in the Browser tab That s why there s a tool editor on the right of it This is done by selecting more than one file by using the Shift or Control key in the File Browser then you can edit those images with the so called Batch tool panel editor The way the sliders value is used to modify the image depends on the options set in this Batch Processing tab When you select a single image the sliders get the values of the processing parameters of that specific image These can be the values of the default profile or the values from your last edit session of this photo If your image is currently
67. ertical or horizontal take care with RawTherapee 4 0 10 User Manual Page 57 of 94 this first movement if you want to have a predictable result If you want to move the point in both directions at the same time then click and drag the point itself To move the point only in one direction only horizontally or only vertically you can use the snap to function by holding down the Shift key while moving the point It s easy to see if a point is on its neutral value i e on the middle line because the color of the point will be green As soon as you move a point off its neutral value it changes color to black oe A neutral point is green modified one is black The HSV Equalizer wraps around on the horizontal axis so the very right vertical line of the HSV Equalizer equals the very left line You can see this by dragging the red line on the left a bit to the left Now the left point of the graph is at the same position as the very right point You can delete points by dragging them out of the editor field You can add points by clicking somewhere on the curve When you place the mouse on one of the points you see a yellow and blue indicator Place the mouse on the yellow one and the cursor changes into a left arrow Now you can drag this point to the left to change the slope of the curve Ditto for the blue indicator To get an idea how this editor works delete all but two colors e g red and
68. eyboard shortcut This will overwrite the PP3 file of the image you re working on found in the same folder next to the image file and or in the cache depending on your settings in Preferences Image Processing Processing Profile Handling You might even want to backup these files together with the processed photos In case you want to start a new edit session from scratch simply open the raw photo and select the processing profile you want to start from Neutral will show you the most basic version of your photo without any modifications See also installation notes Creating processing profiles for general use In RawTherapee we call the sidecar files processing profiles We supply a bunch of processing profiles with RT so that you can start off with an existing look and modify it to your liking saving you some time One example of such a profile is Pop it will make your photo vibrant and lively lifting the shadows and bringing out detail You can see the whole list of processing profiles in the Image Editor tab if you expand the RawTherapee 4 0 10 User Manual Page 22 of 94 Processing Profiles list You can also see them if you right click on a thumbnail in the File Browser tab and move your mouse over to Processing Profile Operations gt Apply Profile You can create your own processing profiles for general use Open a photo you want to create a good starting point profile for Let s imagine this
69. g internal default values hard coded into RawTherapee 2 then overridden by those found in the default raw or non raw PP3 file if d has been set 3 then overridden by those found in the PP3 files provided by p each one overriding the previous values 4 then overridden by the sidecar file if s is set and if the file exists the time where the sidecar file is used depends on the position of the s switch in the command line relative to the p parameters e g p first pp3 p second pp3 s p RawTherapee 4 0 10 User Manual Page 88 of 94 Examples Example 1 In Linux process a single raw which resides in and is called photo raw use its sidecar file photo raw pp3 during conversion save it in the same dir as foo tif and overwrite the file foo tif if it exists rawtherapee o tmp foo tif s t Y c tmp photo raw Example 2 In the next example we ll assume that you want to quickly process all your raw photos from the tmp janeO1 directory to web subdirectory by using the default profile as a basis using the sidecar profile if it exist but with removing some Exif tags e g the camera s serial number and adding some IPTC tags e g your usual copyright parameters plus resize and sharpen the image for the web spread over multiple lines for clarity rawtherapee o tmp Jane01 web eJbototiles tptevppo S DAOL Or LIESVEI 559 profiles web pp3 SE S tmp J
70. g only the Hot dead pixel filter but works only for hot white pixels not for dead black ones Bad Pixels RT can correct a list of bad pixels pixels that are always black or white or stuck to one color for your particular camera model To do this you need to write a text file with the absolute raw coordinates of these pixels each line specifies a pixel with x lt space gt y lt return gt positions If you look at the coordinates of pixels in RT beware of the offset introduced by cut border you must add 4 to each coordinate The file has to be named exactly as your camera maker model badpixels maker must be short name es PENTAX K200D badpixels if you have two cameras with same model you can specify also the serial numbers look at Exif data maker model serial badpixels The file has to be located in the dark frames directory specified in preferences Pixels in the bad pixels list will always be corrected in processed photos Bad pixel detection software There exist programs to aid in detecting such pixels o Dead Pixel Test http www starzen com imaging deadpixeltest htm o Pixel Fixer http www pixelfixer org RawTherapee 4 0 10 User Manual Page 70 of 94 Mamiya ZD Unknown 11 0 1 60 1s064 80mm F temp RawTherapee 200710 007 Flat Field Mamiya ZD Unknown 11 0 1 60s 15064 80mm F temp RawTherapee 200710 007 Orig
71. ghts are available Note that this only works correctly with RTs default profile since the RT dcraw embedded matrix must match the ICC profile Save Reference Image for Profiling Clicking this button saves the linear TIFF image before the input profile is applied This file can be used for profiling 1 creating a new camera profile However since this file does not contain metadata needed for correct profiling e g white level you must transfer this info manually It s generally more advisable to profile the raw file directly Working Profile opecify the working color space this color space will be used for internal calculations for instance for calculating saturation RGB brightness contrast and tone curve adjustments chrominance etc Wide gamut profiles such as ProPhoto and WideGamwut are suitable only for source files of a high bit depth at least 16 bit such as raw files or 16 bit TIFF files but not JPEG images For JPEG files SRGB and AdobeRGB are the best profiles If you are unsure use SRGB Output Profile Specify the output RGB color profile this color space will be used for image output and embedded in metadata RawTherapee comes bundled with a number of custom made high quality output profiles m sRGB similar to sRGB with gamma close to sRGB g 2 40 slope 12 92 m HT sRGB gBT709 similar to SRGB with gamma BT709 g 2 22 slope 4 5 m sRGB 910 similar to SRGB with linear gamma g 1 0 slope 0 m HT
72. gine there are fewer positions within the processing chain where clipping can occur at all RawTherapee 4 0 10 User Manual Page 80 of 94 Date Format Determines the date format of the thumbnails in the file browser window External Editor When you send a raw from within RawTherapee to an external editor for further processing RawTherapee needs to know which program you want to use If that s not the Gimp you can specify the path to your favorite photo editor here Custom Profile Builder Executable or script file called when a new initial profile should be generated The executable receives command line parameters to allow a rule based PP3 generation Path raw JPEG Path default profile f no exposure in secs focal length in mm ISO Lens Camera In the samples folder you can find the RTProfileBuilderSample cs cs config file which can serve as a basis for your own custom profile program It is heavily documented in the files This feature is very powerful to automatically set e g lens correction parameters or noise reduction base on image properties It is called just once on first edit of the picture About Shows information about the original author of RawTherapee and the current version details of the build names of developers and other contributors and the licence under which RawTherapee is published GPL 3 Image Processing Tab Default Image Processing Parameters Specify which profile RawThera
73. have fixed width height proportions You must tell RawTherapee if you want to have a horizontal landscape or vertical portrait crop Use Guide types if you like The PPI value does not change any physical property of the image but sets metadata which describes the intended print size of the current crop or the whole photo if there is no crop For prints up to 13x18cm 5x7 inch 300PPI is a good choice bigger prints can have less pixels per inch Resize Can be applied to the cropped area or to the whole image Choose your preferred resizing algorithm Nearest Bilinear Bicubic Bicubic Softer Bicubic Sharper o Lanczos Lanczos results in the highest quality sampling and is therefore the recommended and default option O O O s You can resize according to o Scale e g have the resulting image 0 5 times the size of the full one o Width by specifying the desired width so that the height is automatically and proportionally scaled o Height by specifying the desired height so that the width is automatically and proportionally scaled o Bounding Box by specifying the maximum width and height you want your image to have and leave it up to RawTherapee to figure out how to proportionally fit your image into this box Warning the effects of the Resize tool will not be shown in the preview This is a RawTherapee 4 0 10 User Manual Page 63 of 94 limitation of RawTherapee s current engine Resizing is done at the end of
74. he final conversion as it is a low quality algorithm for display purposes AMaZE Aliasing Minimization and Zipper Elimination is the default demosaic method of RawTherapee as it yields the best results in most cases VNG 4 used to be in version 2 4 the preferred algorithm for Olympus cameras as it eliminates certain maze pattern artifacts that might be created by the other methods Since version 3 0 of RawTherapee Olympus users might prefer the AMaZE method though DCB is similar to AMaZE it also removes maze artifacts Zoom in to at least 100 1 1 and try all the demosaicing algorithms see which works best for you Try them on sharp photos with fine detail and tiny patterns such as the wavy and repetitive fabric of a sweater watch for maze pattern artifacts a distant brick wall a distant round road sign watch for aliasing along the round edges and test with both low and high ISO shots Use photos from your own camera what s best for Nikon raws is not what s best for Olympus raws False Color Suppression Steps Sets the number of median filter passes applied to suppress demosaic RawTherapee 4 0 10 User Manual Page 6 of 94 artifacts when applying the demosaicing algorithm False colors speckles could be introduced during the demosaicing phase where very fine detail is resolved False color suppression is similar to color smoothing The luminance channel is not affected by this suppression v Demosaicing Method
75. he other controls in addition to the L CP profile e g for artistic reasons or if the LCP fails to correct a parameter which happens on some extreme distortion occasions like with some heavily distorting compact cameras The following restrictions apply LCPsare only supported for raw files JPGs will only correct distortion and CA but not vignetting m While distortion is visible in the full image preview CA and distortion are not reflected in the detail crop windows only in the fully processed result image Auto filling is also not supported m CAcorrection is only supported if the Exif information contains the focus distance e g in DNGs from Nikon files RawTherapee 4 0 10 User Manual Page 64 of 94 Getting LCP Profiles in Linux 1 Install wine 2 Install Adobe DNG Converter http www adobe com support downloads product jsp product 106 amp platform Windows 3 Find profiles for your camera under wine drive_c users Public Application Data Adobe CameraRaw LensProfiles 1 0 4 Copy the relevant profiles to a different folder for easy access Distortion Corrects lens distortion A negative number corrects barrel distortion a positive value will correct pincushion distortion You can place a grid over the image by activating Crop without cropping and using Guide Type Grid This may serve as a guide to correct lens distortion Chromatic Aberration The chromatic aberration can corrected by using the two sliders Red
76. ies below the average are lowered lifted Chromaticity The Lab Chromaticity slider increases or decreases the chromaticity of the image by applying a contrast curve to the a and b channels of Lab space oetting this slider to 100 removes all color making the image black and white B amp W Toning When you enable this option the image will be made black and white and you will be able to apply a color cast e g sepia by using the a and b curves The Chromaticity slider and the CC CH and LC curves will be disabled and not have any effect More info in the a and b curve section below Avoid Color Shift Fits the colors of the image into the gamut of the working color space and applies Munsell correction to retain color purity Restrict LC to Red and Skin Tones When enabled it restricts the effects of the Luminance According to Chromaticity LC curve so that you can make skin fairer by increase the luminance of the skin without changing the model s clothing or background RawTherapee 4 0 10 User Manual Page 3 of 94 Red and Skin Tones Protection When enabled the effects of the Chromaticity slider and the CC curve will not be applied to skin colors so that you can increase the chromaticity of your photo without causing skin to appear oversaturated Curves Lab Adjustments provides a wealth of curves to alter the look of the image Below are illustrated explanations of each curve L Curve The L curve allows to c
77. inal image AFTER Auto Flat Field correction Mamiya ZD Unknown f 12 0 1 100 15050 80mm S _Imaging Settings FlatFields MamiyaZD 80 0 mm f_12 0 20110130 MEF ls Mamiya ZD Unknown 12 0 1 1005 15050 80mm 57 Imaging Settings FlatFields MamiyaZD 80 0 mm f 12 0 20110130 MEF The same flat field image shown with exaggerated contrast and saturation to visibly demonstrate color and luminance non uniformity due to the lens cast effect Flat field image at similar aperture Flat field corrections are used to compensate for the non uniformity characteristics of the camera and lens combination A well known example of such non uniformity is vignetting a peripheral darkening of the image more pronounced in the corner areas Another example more familiar to the users of digital medium format cameras is the lens cast effect both color and luminance non uniformity of the image field Both of these examples of non uniform image capture can be further complicated by a possible misalignment of the lens mount or by the usage of the tilt shift lenses Another set of examples of capture non uniformity is due to light leakage in the camera thermal non uniformity of the sensor or defects irregularities in the sensor readout electronics Manual corrections for these effects in post production are quite difficult especially when to be reproduced on series of images captured under various conditions and would rarely lead to
78. inal is write pl f If you want to save the output image in a directory named converted located in the directory of the opened image write S pl converted f If you want to save the output image in a directory named home tom photos converted 20 10 10 31 write p2 converted d1l f Alternatively you can save directly to a specific directory but in the long run it is much easier to use a template On the left you see a Start Stop processing button and an Auto start checkbox If Auto start is enabled every time a raw is sent to the queue processing will start immediately Usually you will not want this as this will use up your CPU on developing the photos in the queue and as a result all adjustments you do while the queue is running will take much longer to get applied so that you can see their effect in the preview RT will become sluggish If Auto start is unchecked you will have to activate the queue manually by clicking the Start processing button once ready to do so You can pause the queue by pressing the Sfop processing button but RawTherapee will first finish processing the current photo You can delete the contents of the processing queue by right clicking on a thumbnail and choosing Select all then Cancel job You can exit the program and restart it later the batch queue will still be there The queue can even survive a crash of RawTherapee as the batch queue info is written to disk each time you add
79. iodin e huc FU eda E pacti pans ae VIED DING m I MIC t EE E OL DU IEEE ROB Versus Dabo nord ortae Prieto OT De Ed oat eu A Qut lu doc iod OO CIE Color Appearance MOGSI Z002 sis tus Dav rot bua dem cura Ear RO LE AUS T Impulse NOISE KO CUCHOM setas tiep defines dun Sas d ORDER t NOISE JSOOUGIIOD esca uas suia ELE M eI DG IPI RE UU Uu Uc RawTherapee 4 0 10 User Manual Page 2 of 94 2 CDY D 51 Color TaD TET 52 T N Nen 52 VIDIC O EUREN T E 55 Channel eae nen re ne c Da ee eae ee eee Re 56 EE 56 59 Color Managemen ER E R 59 esea a OEE 63 63 Bim EU TI EE 63 7 64 Ie MUR aM D E MI 67 SA GUN PERENNE Er 67 PrOD 9 i i aro T 68 Raw White amp Black ooo te oido 68 uice 69 db elc 70 misiM IIT 71 Chromatic ANDES
80. ix DCP profiles are faster and more precise escp in the highlights so they don t have this restriction Custom Specify a custom DCP or ICC camera input profile stored on your computer RT also parses ICC profiles by CaptureOne and Nikon extracted from Nikon NX2 temporary directory Preferred DCP Profile While RawTherapees own profiles are all single illuminant standard daylight some other DCP profiles contain calibrations for two light sources e g Adobes ones which come with tungsten and daylight With preferred profile you can select which one you d want to be taken if available If the profile just contains one illuminant this option has no effect If the preferred profile type could not be found the most daylight like profile is taken Use DCP Tone Curve some DCP profiles contain tone curves which are not part of the color calibration but may be used to add contrast and brightness to simulate a special image look This is mainly used for profiles simulating camera RawTherapee 4 0 10 User Manual Page 60 of 94 maker settings It is always disabled for RawTherapee s own profiles Blend ICC Highlights with Matrix This setting is not needed for DCP profiles Enable to recover blown highlights when using LUT based ICC profiles This function merges the imprecise but recoverable highlights from the dcraw standard matrix profile into the precise ICC picture So the color precision is reduced there but the highli
81. keep the point at the top ES The CC curve was increased too much resulting in spikes in the histogram and an effect similar to posterization in the image To find the maximum chromaticity boost you can apply without causing nasty spikes which will appear as sudden flat regions of color in the image similar to posterization all you need to do is click Show Hide chromaticity histogram if you haven t done so already and then slowly boost chromaticity until you notice the histogram begins to spike The curve does not have to be linear of course RawTherapee 4 0 10 User Manual Page 39 of 94 QQQQm The CC curve was used to boost chromaticity within a safe limit CH Curve E R 7 4d u rF W RA zI B B Processing Profiles Custom 2 Curves 1 y x b xt Y Fm cc v The CH curve chromaticity according to hue allows to control output chromaticity based on the input hue C f H Using it you can very easily boost or mute only a selected range of colors HIM 2 Q A AQ F The CH curve was used to mute all colors except fo
82. lack and white image Positive RGB Saturation values will lead to hue shifts the larger the value the more visible the shift while positive Lab Chromaticity values will boost colors while keeping their hues correct rendering a crisp and clean result Lab Chromaticity is the recommended method for boosting colors CIE Color Appearance Model 2002 A detailed description of CIECAMO2 principles and how it has been implemented in RawTherapee by Jacques Desmis http code google com p rawtherapee downloads detail name zCIECAMO2 RI en odt Histograms in Tone Curves The tone curve histograms in the CIECAMO 2 section can show values before or after CIECAMO2 is applied To view the values after CIECAMO2 adjustments enable the Show CIECAMO 2 output histograms in curves option If disabled the histograms show values before CIECAMO2 Histograms in the Color Curve The histogram in the Color curve shows the distribution of chroma saturation colorfulness according to the intensity of the chroma saturation colorfulness or chromaticity in Lab mode The more the histogram is shifted to the right the more saturated colors are close to the limits of the gamut The more the histogram is shifted to the left the more the colors are dull The abscissa represents the value of the chroma saturation colorfulness or chromaticity in Lab mode The abscissa scale is open As usual the ordinate represents the number of pixels involved Detail Tab
83. lar but is used for trees and works recursive which means that all values changed removed in this subtree are restored You can Add Edit the following Exif information Artist Copyright ImageDescription and Exif UserComment Only the English names of the Exif fields are displayed for easy reference They are not translated when you choose a different GUI language Tip If you want to add a specific tag to every processed photo such as the Artist tag so that your name will appear Artist field for then do this Open a raw it will be opened with the profile you use by default go to the Exif tab click Add Edit choose Author fill in your name and save this profile with a new name like default exif pp3 Now open Preferences gt Image Processing and set default exif pp3 as your default profile for raw or non raw photos IPTC tab IPTC values belong also to the group of metadata as they are integrated into the image files but do not add any picture details additional or different pixels to the image Basically the metadata summarized as IPTC contains additional information about your image As this information is saved within the image file it cannot get lost This eases the the workflow a lot as you don t have to care about another file when e g backing up or sorting your images IPTC is usually used to describe the image in detail There are a lot image database softwares that use the IPTC information saved in images to e g fi
84. ll their descriptive fields For example you can also use IPTC fields when you try to sell your images Most online companies willing to sell your images support IPTC tags when you upload your images to their databases thus you have less work Adding e g RawTherapee 4 0 10 User Manual Page 8 of 94 keywords on your computer at home is much more comfortable than doing it through the web browser Multiple Keywords and Suppl Categories can be added removed using the plus and minus signs next to it The button Reset under resets the IPTC values to those saved in your current profile There are two more buttons one copies your current IPTC setting to the clipboard This is especially useful when you you want to apply the same IPTC values to multiple images The other one pastes the formerly copied IPTC settings from the clipboard to your current image RawTherapee 4 0 10 User Manual Page 79 of 94 Preferences Window General Tab Workflow Choose here between single editor tab and multiple editor tabs mode If you own a second monitor you can use that one as well With Histogram in left pane and show profile selector you can control what and where the tools are shown in the edit panels If helps you to safe GUI space A restart is required for these options to take effect Default Language Select the language for the GUI out of a list of thirty languages English US is the default mother language translations are
85. mage to which it is applied The flat field is blurred according to any of several user selectable blur types and choice of blur radius The blurred flat field serves as a template for vignetting lens cast etc and used to correct the corresponding issues in the image file Area blur uses a box blur of the flat field file and is the normal use of the correction Use a large blur radius to smooth the flat field image in order to mitigate any imperfections such as flat field image noise dust spots etc Use of a small radius will leave these effects in the flat field image and will leave their imprint on the corrected image file This can be used to advantage for instance if the flat field has the same dust spots as the image file use of a blur radius of 0 1 pixels will subtract out the darkening caused by the dust Use the vertical horizontal or verticalthorizontal blur options if the camera generates repeatable line pattern noise For instance consistently repeatable vertical line patterns can be subtracted off by using vertical blur on the flat field file Organising Flat Fields Non uniformity of the captured field depends on the following parameters e Camera camera amp sensor combination in case when digital back is used Lens Focal distance Aperture Lens tilt shift It is recommended to assemble a library of flat fields for camera lens RawTherapee 4 0 10 User Manual Page 2 of 94 combination taken at various expected to be
86. matic aberration e Distortion correction e Chromatic aberration correction e Vignetting correction Raw Pre Demosaicing Features e Various demosaicing methods to start off by squeezing out the most detail possible from your raw photo Line noise filter White and black point adjustment to fine tune some raw formats Dark frame subtraction to eliminate some forms of noise Flat field correction to easily correct vignetting lens color cast and sensor dust e Manual and automatic chromatic aberration correction The Floating Point Engine RawTherapee 4 is probably the only real time raw converter which does all calculations in precise 32 bit floating point notation in contrast to 16 bit integer as used in most other converters like dcraw and also in RawTherapee up to version 3 0 so nothing gets rounded off and lost Classical converters work with 16 bit integer numbers A pixel channel has values ranging from 0 65535 in 16 bit to increase precision converters usually multiply the 12 14 bit camera values to fill the 16 bit range The numbers have no fractions so for example there is no value between 102 and 103 In contrast floating point numbers store a value at a far wider range with a precision of 6 7 significant digits This helps especially in the highlights where higher ranges can be recovered It allows intermediate results in the processing chain to over or undershoot temporarily without losing information The fraction v
87. meter for each image You can select the desired behavior for each slider in this tab Please note that all RawTherapee 4 0 10 User Manual Page 84 of 94 sliders are not listed because they are supposed to work in SET mode only The option Overwrite existing output file sets RT to overwrite an existing e g output jpg if it exists If this is unchecked and you e g send an image a second time for conversion to the batch queue RawTherapee will add a numeric index to the file name e g myoutput 1 jpg Performance Tab The Performance tab is only for people who know what they re doing It lets you poke under the hood and tweak the parameters of some tools These parameters take part in the balance between speed and stability Maximum Number of Threads for Noise Reduction The Noise Reduction algorithm in RawTherapee is very powerful It is also quite CPU and memory intensive People with weak hardware who experience crashes caused by running out of RAM may find that tweaking this parameter prevents those crashes at the cost of taking longer to process the image Noise Reduction a baseline 128MB of RAM for a 10 megapixel raw photo or 512MB of RAM for a 40 megapixel one and additionally 128MB RAM per thread The more threads run in parallel the quicker the computation but higher the memory requirement Most modern CPUs run two threads per physical core Find out what CPU you have and how many cores it has multiply that by two
88. must be exceeded for the suppression to be applied Noise Reduction RawTherapee s powerful Noise Reduction tool lets you eliminate noise while retaining detail It uses wavelets and a Fourier transform to work its magic As with all tools in the Details tab to see the effects you must zoom in to 100 1 1 or more To find the best set of Noise Reduction values for your image 1 Check the sharpening tools to make sure that you re not sharpening any fine detail because your noisy photo has no fine detail All they would do is amplify the noise If you re using Contrast by Detail Levels to give the image more depth make sure that the first O Finest slider is turned off 2 Zoom into the photo to 100 and find an area that has both sharp in focus parts as well as large plain out of focus ones so that you can prevent noise reduction from destroying details as you tweak it 3 Start by setting the Luminance Detail slider to O 4 Increase the Luminance slider until the luminance noise has been smoothed away 5 Because luminance noise 15 all gone now though we haven t recovered any detail yet this is a good time to denoise the color channels Increase Chrominance Master to a level where chrominance noise is gone but color detail in small objects hasn t been lost You can reduce or boost the effects of noise reduction on the red and blue channels by respectively lowering or raising the Delta Chrominance Red Blue sliders In most cases 0 shoul
89. n all directions Works well for correcting vignetting and lens cast Blurs flat field in vertical direction to compensate for vertical non uniformities Vertical This is useful if vertical sensor readout has variation between the columns Blurs flat field in horizontal direction to compensate for horizontal non uniformities Horizontal This is useful if horizontal sensor readout has variation between the rows RawTherapee 4 0 10 User Manual Page 4 of 94 Vertical Blurs flat field sequentially in horizontal and then vertical directions Horizontal to compensate for both vertical and horizontal non uniformities Blur Radius Blur radius controls the degree of blurring of the flat field data Default value of 32 is usually sufficient to get rid of localised variations of raw data due to noise Setting the Blur Radius to O skips blurring process and allows to correct for dust and other debris on the sensor as long as their position has not changed at the expense of carrying noise from the flat field file into the corrected image If such correction is desired it is advisable to create flat field files with minimum amount of noise at the lowest ISO setting and optimal light exposure All parameters in the flat field panel are saved into the development profile of the image being edited These settings can be copied and pasted to other images just as all other development settings This includes flat field auto selection option P
90. ne Channel Mixer This function is used for special effects for color and black and white alike The Channel Mixer is divided into three sections Red Green and Blue Those sections represent the three available color output channels in a RGB image All values shown here are percentages The mixer makes a new R channel from the specified percentages of the existing R G and B channels similarly for the other channels Among the uses of the channel mixer a IR and black amp white photography using the mixer to achieve desired tonal values for different parts of the scene b Extending the range of White Balance beyond the 1200 12000 range of the WEB tool In the channel mixer for the values that have a starting value of 100 enter values other than 100 and you are in effect changing the white balance ie only changing the R slider on the R channel only the G slider on the G channel and only the B slider on the channel Get the image into the right ballpark then use the temp tint sliders of the usual WB tool to fine tune In principle this allows an arbitrary range for WB HSV Equalizer Use the HSV Equalizer Hue Saturation and Value to selectively change colors e g make the sky more dramatic by making it somewhat darker or more saturated RawTherapee 4 0 10 User Manual Page 56 of 94 without touching other colors It can be very useful for correcting skin tones as well ncorrect use may produce effects resembling the analog
91. ntly than before CIELab CIELab reduces the luminance channel and tries to restore colors afterwards Blend This restoration mode attempts to guess clipped color channels by filling in their values from the closest match from unclipped highlight regions nearby Note that the effectiveness of highlight reconstructions can be influenced by use of Flat Field Correction if it in its own turn brightens the image for example when image periphery is brightened to compensate for vignetting In such case disable flat field correction for better reconstruction of highlights Shadows Highlights Use this tool to independently influence the highlights and the shadows of the image yes another one Take care with the High quality option as this one is quite cpu intensive Highlights The Highlights slider makes the brightest parts of the image less bright RawTherapee 4 0 10 User Manual Page 34 of 94 without touching the darker tones To make the effect stronger use higher values A slider value of 100 will turn the whites light gray Tonal Width for Highlights This slider controls the strength of the Highlights slider Higher values give a stronger effect A value of 100 combined with Highlights 100 turns the whites into middle gray you probably won t want that Shadows This slider lifts the shadows and applies an effect that is sometimes called fill light or fill flash in other software Higher values lighten th
92. o Profile Bypasses camera input color profile Colors are closer to camera raw data Useful in exceptional cases where camera records colors far RawTherapee 4 0 10 User Manual Page 59 of 94 outside conventional color gamuts Camera Standard Uses a simple color matrix by dcraw enhanced RawTherapee version whichever is available based on camera model or embedded in DNG Auto Matched Camera Specific Profile Uses RawTherapee s camera specific DCP input profile that is more precise than a simpler matrix and fall back to lesser powerful ICC profiles if no DCP is available Available for some cameras these profiles are stored in dcpprofiles or fallback iccprofiles input directory and are automatically retrieved based on file name matching the exact model name of the camera as it appears in the info section in the Editor E g Canon EOS 5D Mark III dcp In other words if Auto matching is selected RawTherapee will try to do the following in this sequence 1 locate a DCP profile in dcpprofiles 2 if DCP is not found locate an ICC profile in iccprofiles 3 if DCP and ICC are not found revert to the hard coded camera matrix Camera matrix values are generally from dcraw but in some cases have more accurate custom overrides based on measurements with ColorChecker 24 Please note that when ICC profile is used the Highlight Reconstruction is not as efficient As an mitigation enable the option Blend highlights with matr
93. ons but with the lens cap on Only raw images for the same Camera model can be used as dark frame Attention this method is not effective with high ISO noise because of its different random nature In the Dark Frame panel you can specify a single shot to subtract from the image or check Auto Selection and let RT choose the best match from one directory specified in Preferences To select the directory go in Preferences tab Image processing and select Dark Frame Directory you may wait a little after selection because RT scans all files in that dir Under the widget RT shows how many shots are found and how many groups of shots are found and averaged into a template From now on put your darkframe shots there if not already done You could also move a shot that you find to be a dark frame with right click menu in thumbnails browser Move to dark frame directory RT chooses the best match looking for same camera model shots with minimal difference in ISO exposure duration and date If more then one shot with exactly the same properties is found then an average of them is used this produces by far less noise so its better to have 4 6 frames taken in the same conditions of the actual photo When selecting a dark frame or with autoselection RT extracts from it all the positions of hot pixels and then always corrects them in the final image This RawTherapee 4 0 10 User Manual Page 69 of 94 correction is better than applyin
94. ontrol output lightness based on the input lightness L f L The histogram on the L curve reflects lightness prior the Lab adjustments Before B amp W toning Avoid color shift Restrict LC to red and skin tones Red and Skin Tones Protection 005 SS Curves L ye Lk v b v4 M b The L curve was used to lighten the image while preserving the shadows An S shaped curve applied to the L channel increases image contrast At the same time this leads to a perceptually desaturated look Chromaticity adjustments can be used to compensate for this effect CC Curve The CC curve chromaticity according to chromaticity allows to control output chromaticity based on the input chromaticity C f C The histogram on the CC curve reflects chromaticity before the adjustment You can use the Show Hide chromaticity histogram button besides the histogram to help you see the effects of your CC curve tweaks on the histogram and to help you find the maximum value before you start clipping colors The screenshots show what the chromaticity histogram looks like for the untouched image and then what happens when you increase chromaticity too much you can do this using the Chromaticity slider or as in the screenshot by sliding the top right RawTherapee 4 0 10 User Manual Page 38 of 94 point of the CC curve to the left Holding the Shift key while you slide the point will help you
95. orward due to the nature of Linux systems While the Windows version of RawTherapee comes bundled with all required libraries to run on any Windows version Linux distributions differ significantly from each other and as a result a version of RawTherapee built for one distribution is unlikely to run under a different distribution This should not be a problem though as builds of RawTherapee are available for most distributions so you should just install it the usual way using the distribution s package manager The cache folder can be found in cache RawTherapee and you can simply copy it over to a portable medium and then copy it back to the same place on the destination system You most likely only want to keep the processing profiles so just copy the cache RawTherapee profiles folder Note that on some distributions the RawTherapee cache folder name might have a version number appended e g cache RawTherapee4 0 10 profiles RawTherapee 4 0 10 User Manual Page 11 of 94 Using RawTherapee First Run The first time you start RawTherapee you will most likely see an empty file browser tab This is because you need to tell RawTherapee where your raw photos are stored Use the directory tree browser on the left of the File Browser tab to navigate to your raw photo repository and double click on it Now RawTherapee will generate thumbnails of your photos in the central panel The first time you open a folder full of raw photo files
96. pee has to use when opening a raw and when Opening a non raw photo When you have made your own default profile you can tell RawTherapee to always use that one The profile for non raw files like jpg or tif can probably best set to neutral The neutral profile just loads the photo as it is without applying for example Auto exposure or sharpening Processing Profile Handling oave processing parameters next to the input file When checked RawTherapee writes a PP3 file with all the edits you made to your photo next to the input raw file This represents your work e g sharpening settings used and can be reloaded later RawTherapee 4 0 10 User Manual Page 81 of 94 Save processing parameters to the cache Instead of creating a PP3 file next to the raw this option when checked writes the PP3 to the cache When you check the last option only chances are that you lose your work the edits when installing RawTherapee on a new pc for example Its usually a good idea to only save the processing parameters next to the input file since you can e g back them up along with the your raws Dark Frame opecify the directory on your hard disk for searching for the dark frame shots for long exposure noise subtraction File with coordinates listing of the bad pixels must be placed in the same directory for auto correction Flat Field opecify the directory on your hard disk for searching for the flat field reference images Metadata
97. perfect corrections Flat field correction tools in RawTherapee allow both automated and user guided RawTherapee 4 0 10 User Manual Page 1 of 94 modes Flat field correction is performed only on linear raw data in the beginning of the imaging pipeline and does not introduce gamma induced shifts Thus in RawTherapee flat field correction can be applied to raw files only Due to performance considerations thumbnail images do not reflect flat field corrections At present time only preview in the Editor and the output image can be flat field corrected Accuracy of the flat field correction is largely based on use of the appropriate flat field image file Flat Field raw image is usually a de focused photograph of a uniformly lit uniformly colored and toned subject such as a piece of white matte paper Another method of capturing flat field reference image is to use a uniform piece of white Plexiglas in front of the lens at full contact with the lens filter barrel and photograph it against a preferably uniform illumination e g point camera towards the clear sky The idea is to provide a uniform entrance illumination into the lens As a result all non uniformities of the lens camera combination can be recognized in the captured raw image as deviations from the ideal spatially uniform flat field response Algorithm Specifics amp Concise Summary The user or auto selected raw flat field image need not have the same white balance as the i
98. photo is opened in its own Editor tab The filmstrip is hidden in this mode Having multiple photos opened at the same time requires more RAM Try both modes and see which one suits you better To do that click on the Preferences icon Win the top right corner of the RT window and choose General Layout and set Editor Layout to your preferred choice Use this Preferences window to select another language for the user interface to choose another color theme change the font size etc It is also possible to start RawTherapee without the File Browser tab by specifying RawTherapee to open an image from your operating system s file browser or by using the image filename as an argument when starting RawTherapee from the command line The Image Editor Tab Take a moment to explore the mage Editor tab The central panel holds a preview of your photo This preview is generated from the actual raw data by processing it according to the settings either you manually set or those that are stored in the processing profile used to open that photo as specified in Preferences gt Image Processing gt Default Image Processing Parameters The preview will show you the effect of all the adjustments you make Note that some adjustments such as sharpening and noise reduction are visible only when you are zoomed in at 10096 1 1 or more On either side are panels which show information about the currently opened image and which contain tools with which yo
99. r purple and violet LC Curve v i Processing Profiles 0 Custom Curves L Y v xis v b 7 5 c 7 The LC curve lightness according to chromaticity allows to control the output lightness based on the input chromaticity L f C This type of image control is uncommon in imaging software but is provided in RawTherapee 4 0 10 User Manual Page 40 of 94 RawTherapee and is very powerful The LC action is modulated by the Restrict LC to red and skin tones checkbox Thus the LC curve provides a complex image control altering lightness based on image chromaticity and also targeting a specified range of hues With this option enabled the luminosity of only red and skin tones is affected for example allowing you to make skin fairer and conceal wrinkles and blemishes while preserving the color of the model s clothes and background When it is disabled the LC curve acts on other colors as well The coloring of the bar on the horizontal LC curve axis changes to reflect which colors the curve applies to as chosen by the state of the Restrict LC to red and skin tones checkbox as Before After VK eoumxum L 4 1 mmm D 7 MN UE jcc y Y
100. reedesktop stereo RawTherapee 4 0 10 User Manual Page 86 of 94 How to Obtain Nikon Profiles from NX2 Capture NX 2 and View NX are proprietary Windows software provided for Nikon cameras and are able to accurately develop raw images to match the in camera rendering Behind the scenes both programs generate ICC profiles which incorporate recipes for tonal changes according to their adjustments Such profiles can be used as input ICC profiles in RawTherapee to lead to almost identical rendering following the same recipe The Nikon input ICC profiles are proprietary and cannot be distributed Fortunately this software extracts and generates input profiles on the fly in a temporary folder during runtime Please coordinate use of these profiles according to licensing agreement of Nikon software You can use installation of trial versions of Capture NX 2 and View NX to try the process below to refer to the generated profiles within RawTherapee 1 First you have to install Capture NX 2 version 2 3 8 was tested the trial version is sufficient but View NX 2 free should also work 2 Open the NEF file in Capture NX 2 While the program 16 running and your picture is open by the program look at the following hidden folder lt Windows directory gt Users lt your username gt AppData Local Temp Nkn lt random The temporary ICC profiles will be created in this folder similar to this Nkx 090 962 1 03 0
101. s so it will down sample them to 8 bit ones You can specify your external editor of choice in Preferences gt General gt External editor RawTherapee 4 0 10 User Manual Page 24 of 94 The Toolbox The panel on the right side of the preview contains the controls for all the tools available in RawTherapee They can do a lot perhaps even more than you ever may want to If you re new to RawTherapee or new to raw processing in general don t feel overwhelmed as there is no need to touch all those sliders to get decent results In this section you ll find a brief description of what all those tools are for tab after tab Panels A panel is a foldable element and is also frequently called a Tool or Section Right clicking over a panel s title opens it and closes all other panels of the same tab You ll learn to love this shortcut when you ll consider the time you ll spend on folding sections manually Sliders Each slider has three values in memory 1 the current value when you move the slider to any position 2 the default value the one that the programmer has set as default It can be called back by clicking the Reset button 3 the initial value which is the value of the profile used when the image was loaded in the editor It can be called back by Control clicking on the Reset button Curve Editors Each curve editor has a button to select its type It s a so called Toggle button i e it
102. s demosaicing are applied to it Additionally you can show or hide the RGB Indicator Bar which is situated under the histogram and shows the exact place on the histogram of the enabled R G B or L values of the pixel your cursor is currently hovering over The histogram can be moved to the left panel from Preferences Layout Just under the histogram is a drop down list called Processing Profiles This is an important concept in RawTherapee Every time you open an image a profile is applied A profile is a set of instructions regarding which demosaic algorithm to use to interpret the raw data whether a sharpening filter is to be applied if auto exposure is enabled etc These profiles are simple text files and it s easy to make your own For clarification these processing profiles have nothing to do with camera profiles or color profiles By default RawTherapee opens raw files with the Default profile and non raw files with the Neutral profile but you can change them if needed by going to Preferences gt Image Processing gt Default Image Processing Parameters RawTherapee 4 0 10 User Manual Page 14 of 94 Preview modes In addition to the normal preview RawTherpaee supports a number of other preview modes to help you tweak your photos Preview modes are controlled via buttons in the Editor toolbar or via shortcuts Only one preview mode can be engaged at a time The following preview modes are currently supported Red channel
103. s how transparent a pixel is These alpha channels also have a color resolution of 8 bits Both PNG and TIFF files can also handle alpha JPEG cant If you have an 8 bits per channel image with an alpha channel it can also be described as a 32 bit image 8 G 8 B 8 alpha 8 32 The ultimate problem is that you can also have an image that assigns as many as 32 bits per color channel These images can be described as 32 bit images as well as 96 bit images because R 32 32 B 32 96 All real files are stored in image formats that assign at least 16 bits floating point per color channel such as the EXR format or 32 bits such as the RGBE format To summarize an 8 bit per channel image can also be called a 24 bit per pixel image and a 16 bit per channel image can also be called a 48 bit per pixel image In both cases use the former the full x bit per channel description don t just say x its more clear RawTherapee 4 0 10 User Manual Page 21 of 94 what you mean Naming If your original raw file was called DSC 1000 raw the processed file name will be DSC 1000 pg or tif or png There s an option in the Save current image window Automatically add a suffix if the file already exists When checked you can make different versions of one raw which will be saved as DSC 1000 jpg DSC 1000 1 jpg DSC 1000 2 etc The same applies when you send different versions of
104. save to JPG 8 bits per channel TIFF 8 or 16 bits per channel and to PNG also 8 or 16 bits per channel You can also select Save processing parameters with image this options writes a sidecar file with all your adjustments made to that photo in a plain text file This file will have the same filename as your photo but it will have a pp3 extension You can set where you want the resulting JPG PNG or TIFF image saved to by entering an appropriate template in the Use template field in the Output Directory panel To find out how to create a template hover your mouse over the Use template input box and a tooltip with an explanation will pop up You can use the following formatting strings Cd ols GOD b ans oe le These formatting strings refer to the different parts of the photo s pathname or some attributes of the photo For example if the photo being processed has the following pathname RawTherapee 4 0 10 User Manual Page 19 of 94 home tom photos 2010 10 31 dsc0042 nef the meaning of the formatting strings are d4 home lt d2 photos cou exerce t 0042 1 home tom photos 2010 10 31 5 2 home tom photos p3 home tom 5 4 home will be replaced by the rank of the photo If the photo is unranked r will be replaced by Q If the photo is in the trash r will be replaced by x If you want to save the output image where the orig
105. scards metadata There is some confusion over the naming of 8 16 24 and 32 bit files Here is a clarification but it gets confusing so put your tin foil hat on You do not actually need to read this to use RawTherapee it is just background knowledge Each of the red green and blue channels stored in a JPEG PNG or TIFF file is actually a colorless image but when you combine these three colorless images together you get a color image This is how all digital representation of images works color images are always decomposed into their components in one way or another Of the file formats that RawTherapee can save to JPG PNG and TIFF each pixel contains information for three color channels red green and blue We say 8 bits per channel to make it clear that these 8 bits apply to one color channel only The reason is that you might encounter references to 8 bit images and here it gets confusing because the person who wrote that may have been referring to a grayscale format which stores only one channel or to a color format that stores three channels with 8 bit precision each Another notation for the very same 8 bit images that RawTherapee saves is 24 bit Woo confusing Or is it Each pixel is made of 3 channels and each channel stores 8 bits of data so we have a total of 24 bits of data per pixel It gets worse Image editing programs can also store a fourth channel called alpha To put it simply alpha describe
106. t by Detail Levels so you might need to avoid using them if your machine and operating system are not up to standard RawTherapee 4 0 10 User Manual Page 9 of 94 Installation notes Processing profiles with a PP3 extension for version 3 processing profiles or PP2 for the older version 2 can be stored in and retrieved from a cache or relative to the photo being developed You can choose whether RT should use the cache write the processing profile alongside the image or both from Preferences gt Image Processing lt is advised to store these files alongside your input image files so that if you decide to move the image you can move the processing profile easily along with it Processing profiles can evolve from one version of RawTherapee to the next We strive to ensure backward compatibility but this is not always possible Processing profiles can get new parameters or lose the ones that became obsolete Tool behavior can also evolve wherein default values change or in extreme cases the meaning of a value is interpreted differently example of this is the noise reduction tool where a luminance noise reduction value of 10 in RT3 would lead to a different result in RT 4 0 10 where the whole noise reduction engine has been greatly improved Consolidating processing profiles into a cache allows one to store isolated copies of the processing profiles per specific version of RawTherapee In such a case the cache can be used to re process
107. the average luminance level Tonalities above the average are lifted lowered while tonalities below the average are lowered lifted The same contrast curve is applied separately to each R G and B channel Saturation This slider makes the photo more or less saturated In more technical terms it adjusts the saturation of the image by applying a multiplier to the saturation level of pixels in the HSV color space Set this slider to 100 to create a black and white image or enable the B amp W toning checkbox in the Lab Adjustments tool explained later Tone Curves Here you can construct your own tone curves They work on all three R G and B channels at the same time so you can t work on the R channel only There are two tone curves available three curve types Custom Parametric and Control Cage the Linear type simply disables the curve and four modes Standard Weighted Standard Film like and Saturation and Value Blending all explained later on Clicking on the curve icon hides the curve from the RawTherapee 4 0 10 User Manual Page 30 of 94 interface it does not disable the curve While you can use only one tone curve to make your adjustments you can gain much finer tonal control if you use two curves at once The typical use of both curves is to lower values using the first curve and to raise values using the second one It is similar to creating an S curve in one of them but you should be able to make finer adjustmen
108. the same raw to the batch queue By the way your original raw will never be altered by RawTherapee Sidecar Files Processing Profiles If you enabled Save processing parameters with image you will notice that there is a second file next to your output file It has the same filename as the output file but it has the PP3 file extension This is a little text file that describes exactly what edits you made to your photo Open it in a text editor and take a look Whenever you re open that raw in RawTherapee this file will be read and all the settings from the last session will be restored the profile displayed under Processing Profiles will change to Last saved so you ll never have to wonder what the sharpening settings were for a certain photo that you edited two weeks ago because everything is recorded in this sidecar file to be more precise nearly everything as ranking information and the history panel contents are not stored in this file yet By default this information is also saved to a cache on your hard disk here the ranking info is available In Preferences gt Image processing you can disable the generating of these sidecar files But why would you They represent all the time consuming work you did on a photo so keep your work PP3 files are written each time you close a photo or close RawTherapee You can also very easily force saving the processing profile of the photo you are working on by hitting the Ctrl Shift S k
109. tical axis corresponds to opacity 0 at the bottom transparent sharpening not visible 100 at the top opaque sharpening visible The horizontal axis corresponds to luminosity select the tonal range that will get sharpened the darkest tones at on the left progressing to white tones on the right As mentioned in the tooltip to move each of the points in the threshold tool individually hold the Shift key before clicking on a point with your mouse Holding the Ctrl key while moving a point with the mouse allows for very fine movements When moving the right pair of sliders to the left side sharpening is reduced in the highlights When moving the left pair of sliders to the right side sharpening is reduced in the shadows and minimizes amplification of dark noise The default threshold values will protect from over sharpening in most cases and limit the sharpening effect to midtones Sharpen Only Edges lf you activate Sharpen only edges then uniform areas will not be sharpened This is useful when sharpening noisy photos Two new sliders appear as well Radius The Radius is used for the noise detection If the noise is low a lower radius can be used and vice versa A higher radius slows down the image processing RawTherapee 4 0 10 User Manual Page 4 7 of 94 Edge Tolerance Edge Tolerance determines how much a pixel has to differ from its neighbor to be considered as an edge and not as noise It s very similar to the USM
110. tri F4 F11 1 or Shift B Ctri E Ctri S Ctri Shift S Ctrl Shift Z Ctrl Z Double click on canvas outside photo F H Right click in the preview area 5 Shift drag crop W r 9 b Action owitch to File Browser Switch to Queue owitch to Editor when in single tab mode Toggle fullscreen Zoom to 100 Zoom out Zoom in Background color of image preview theme based Background color of image preview black Background color of image preview white Show hide highlight clipping Show hide shadow clipping Before After view Crop tool Shift click drag within the cropped area to move the entire crop border Edit current image in external editor oave current image Save current processing profile the one next to the image file and or in the cache Use this to minimize damages if RT crashes Redo Undo Cycle canvas color black theme background color white Fit to screen Hand cross tool standard use this to navigate around a zoomed image or to move the frame that defines where the detail window is Show hide Exif info overlay Get back to default cursor after having used the pipette for white balance or the straightening tool If RGB indicator bar is enabled this freezes un freezes its indicators Select straight line Rotate tool Allow to move crop border White balance Toggle Preview mode Red Toggle Preview mo
111. ts by using both without entering too fast in the danger zone where your colors becomes unrealistic You can save a curve to disk Click on the Save current image icon cA next to the graph and give it a name Use the Load a curve from file icon Wi to apply this curve later to another file Use the Reset curve to linear button to delete all the points you created and to reset the curve to neutral linear You can also Copy El and Paste curves to from RawTherapee s own clipboard which comes in very useful if you want to quickly apply an identical curve to a different tool You can use as many control points in a curve as you like You can set all three curve types if you like but only the one that is selected in the dropdown menu will be applied to the photo Linear Curve This represents the unaltered or linear image so without any tone curve applied It disables the curve Custom Curve This is a classic type of curve seen in many other programs as well The left part of the graph represents the darker tones the right part represents the brighter tones of the photo Click on the curve to mark a point and drag it with the mouse to change tonalities Dragging the point down makes the image darker while pushing it up makes it brighter The dotted diagonal line marks the linear or unaltered state of the photo Press and hold the Control key to slow down the movement Hold the Shift key to snap the point to key elements maxim
112. u can squeeze out all the juice your photo has to offer The Left Panel To the left is a panel which shows the RGB HSV and Lab values of the pixel your cursor is currently hovering over This is called the Navigator Under it is the History RawTherapee 4 0 10 User Manual Page 13 of 94 panel While editing a photo all your actions are recorded in this history panel clicking on the different entries you can step back and forth through the different stages of your work Under the History panel is a panel called Snapshots use is in that you can save a snapshot of the photo with all the adjustments up to that point in time and then proceed to further modify your photo to give it a different appearance saving new snapshots at every moment you feel you might have reached a version of your photo worth saving Once you have two or more Snapshots you can just click on them to flip through the different versions and stick with whichever one you like best In the future all history items and all snapshots will be saved to the sidecar file For now the history and snapshots are lost when you load a new photo in the Image Editor or close RawTherapee The Right Panel To the right at the top is the histogram panel It can show the histograms of the red R green blue B and CIELab Luminance L channels of the photo as it would look if you saved it or it can show you the histogram of the raw file before any transformations such a
113. ue cross processing technique When used for black and white be sure that the raw is desaturated by setting the Lab Saturation slider on the Exposure tab to 100 or by enabling the B amp W toning checkbox also in Lab Adjustments The HSV Equalizer does not work when the raw file is desaturated by setting Exposure Saturation on the Exposure tab to 100 The HSV Equalizer is of a so called flat curve type which needs some explanation Open a raw file click on the drop down icon next to the H ue button and choose Minima Maxima control points You l see six dots on the horizontal line in the middle and six vertical lines that cross these dots If you look very well you ll notice that those lines are colored from left to right red yellow green aqua blue and magenta Now click on the very left dot the cursor changes into a little hand and move it slightly upward and downward Result red colors quickly change to green blue and magenta as the cursor is moved up and to pink blue and green when moved down Notice that a new horizontal line appears when you start dragging a color point and see how its color changes he vertical axis represents input colors and the horizontal axis output colors EH The input color green vertical line was changed to the output color blue horizontal line When you click and drag a vertical line the line not the point the very first movement will determine the kind of move v
114. um value minimum value middle value i e snapped to the diagonal or horizontal dotted line same value of the preceding point same value of the next point and for the Control Cage type the line going through the previous and next points Delete a point on the curve by dragging it out of the editor area The top right point represents the brightest areas in the photo Drag that point vertically down to make the highlights less bright move it horizontally to the left to make bright areas brighter perhaps at the cost of some overexposure The bottom left point represents the darkest areas in the photo Move that RawTherapee 4 0 10 User Manual Page 31 of 94 point horizontally to the right to make the photo darker perhaps at the cost of some underexposure Move it vertically up to make the darks lighter Flip the diagonal line from bottom left and top right to top left and bottom right to produce a negative image S Curve A typical usage of the custom curve is to construct a so called S curve Mark three points at the coordinates 1 1 2 2 and 3 3 respectively Drag the point at 1 1 somewhat lower and the point at 3 3 a bit higher Your image will get more punch this way If your S curve is symmetrical ie if you move the point you first placed at 1 1 by the same amount as the one you placed at 3 3 but in the opposite direction then the effect will be identical to manipulating the Contrast slider Parametric Curve
115. ure and on the internet are averages The precise temperature and tint combination you should use for daylight photos is specific to the ICC or DCP input profile auto matched to your camera by RawTherapee This will give you a technically color accurate image where whites are white though aesthetically it may not be what you want RawTherapee 4 0 10 User Manual Page 53 of 94 Nikon Nikon Nikon Nikon Nikon Nikon Nikon Nikon Nikon Nikon Olympus Olympus Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Pentax Pentax Sony SOY Sony Spot WB When you click on the Spot WB button d shortcut W the cursor changes into a pipette when it is on the photo Click on a gray or white area to determine the correct white balance You may do this several times on different places in the photo Use the Size drop down box to change the size of the pipette This tool can be used as well inside a detail window Right click to cancel the tool and to get the regular cursor back MODEL EOS cLID MKIII HOS 01 HOS 40D HOS 400D EOS 4500 BOS 2D BOS 9010 BOS X EOS 060 G12 D200 B300 D3000 DS L000 D35 D50 D53 00 D700 D7000 G10 E 1 E P2 DMC G1 DMCEGO DMC GH1 DMC GH2 DMC FZ150 DMC FZ35 38 K10D K200D A700 A900 NEX 5N A55 SLT A55V TEMP 4871 2 1 39
116. used for real image capture aperture settings It is advisable to name flat fields descriptively so that files can be recognised easier by the user preferably incorporating all parameters listed above During flat field correction process these parameters are being read from Exif data only and contents of the file name is irrelevant from this perspective The flat fields should be stored in a dedicated directory RawTherapee allows to point to it via Preferences gt Image Processing gt Flat Field gt Flat fields directory Setting that directory initiates an analysis of its content A counts of qualifying files and templates is reported in the UI MamiyaZD 1 0110130 MEF MamiyaZD 1 110130 MEF MamiyaZD 150mmF10 MEF MamiyaZD 5 110130 MEF f 10 0 1 1005 15050 150mm f 6 3 1 100s 15050 150mm f 10 0 1 100 15050 150mm f 10 0 1 1005 15050 55mm EE ud MamiyaZD 5 0110130 MEF 0 5 110130 MammryaZD 5 0110130 MEF MamryaZD 8 110130 MEF Thumbnails of sample Flat Fields displayed in RawTherapee file browser Auto Selection Flat field Auto Selection capability can be engaged simply by checking the Auto Selection checkbox RawTherapee will search through the in the Flat Fields directory specified in preferences and select the exact or if not available the closest Milmatch to the image being corrected based on Camera Make Camera Model Lens Focal distance Apertur
117. yellow and move the graph around change its slope and see what happens to your photo Dragging all the color points to their maximal values completely up gives an image that is about the same as when no points have been changed ie Linear Same when all sliders are set to their minimum positions down Reset the Hue curve to linear no changes by clicking on the reset icon next to the Value button To compare the effects of the Hue curve with linear switch between Linear and Minima Maxima control points in the drop down menu next to this button or use the history list on the left side of your screen You can save a curve for later use by clicking on the disk button Note that only the actual shown H S or V curve is saved not all three at once So don t give your curve a name like my hsv because it doesn t describe whether the curve inside it is H S or V but instead name your saved curve files something like my hue my sat and my val The extension will be added automatically RawTherapee 4 0 10 User Manual Page 58 of 94 RGB Curves RGB curves allow to apply a curve adjustment individually to each of the RGB channels This provides a fine control over image color balance when curves applied to each of the RGB channels are different Using RGB curves one could make warmer highlights or colder shadows simulate film cross processing effect etc Luminosity Mode The purpose of Luminosity Mode in the RGB Curves tool
118. you can refer to folders full of photos as albums RawTherapee will read each file and extract the embedded JPEG thumbnail from it every raw photo has an embedded JPEG thumbnail sometimes even a few of various sizes This can take some time on larger folders but it only happens the first time you open it The JPEG thumbnail embedded in each raw photo is identical to the out of camera JPEG image you would get if you shot in JPEG mode or in raw JPEG mode This JPEG is not representative of the actual raw data in that photo because your camera applies all kinds of tweaks to the JPEG image such as saturation boost contrast sharpening etc The moment you open a raw photo for editing RawTherapee ignores the embedded JPEG image and reads the actual raw data It processes this data according to the settings contained in the default image processing parameters for raw photos file as specified in Preferences gt Image Processing When you first install RawTherapee the default processing profile chosen for raw photos is eponymously called Default This profile contains mostly neutral settings and a few tweaks on top of that which should result in a pleasant photo which you can either save straight away or continue tweaking to your taste This photo will not look like your out of camera JPEG or like the original thumbnail you saw for that photo which is identical to the out of camera JPEG From the moment you open that photo its thumbnail in the

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