User Guide PQF Files Manager
Contents
1. 3 1 3 2 Simplified CUSTOMIZAtION u u U A SNS AS S Nusa 3 4 3 2 1 The first tab Main settings sise 3 5 3 2 2 The second tab Segmentation ses 3 7 3 23 The hird tab HIStOQEAm Seccion reete ei ed ae s kayaka asa u apaspa capa 3 9 3 2 4 The fourth tab Contraste 3 11 3 2 5 The fifth tab Dithering iii 3 13 3 3 Advanced parame ters 3 17 3 9 1 The first tab Maid Settings di dte ct td eed te edere 3 18 3 3 2 The second tab Segmentation ss 3 20 3 3 3 The third tab Histogram octi te AE he e eet ee 3 22 3 9 4 Thefifth tab Ditherlng aia en ee me be Ge hee den eee igne 3 24 22 A2 55NS REV2 vi USER GUIDE PQF FILES MANAGER 22 A2 55NS REV2 Figures list Figure 3 1 CompAfpToNpp in Composers Manager mode sise 3 1 Figure 3 2 Imposition Parameters tab POF files Manager 3 2 Figure 3 3 List of Print Quality parameters files ss 3 3 Figure 3 4 Parameters file Main settings tab 3 5 Figure 3 5 Parameters file Segmentation tab 3 7 Figure 3 6 Parameters file Histogram tab inner eee 3 9 Figure 3 7 Parameters file Contrast ID sa ea gri epe teta pei 3 11 Figure 3 8 Parameters file Dithering tab sisi 3 13 Figure 3 9 Parameters file Main settings advance2. Dithering screen for photographics classical S96pPSR_Std12 sen i 1 N85 scn Nipson dispersed NB5L scn O hybrid N85xL sen S106cRFT scn Dithering for graphics Mode for graphics Dithering screen for graphics 9 classical S35pBmod scn N85 scn N85L scn O Nipson dispersed NESKL sen S106cRFT scn Figure 3 8 Parameters file Dithering tab This last tab Dithering allows to define the dithering mode for photographic and graphic images that means the transformation mode used to pass from images in gray levels to printable images in black and white 22 A2 55NS REV2 3 13 3 14 USER GUIDE PQF FILES MANAGER One can choose a dithering mode for the photographic images and another mode for the graphic images Note that if Validate photographics and graphics separation of Histogram is not selected Dithering for graphics is also disabled 3 dithering modes are available classical classical mode with screens Nipson dispersed dispersed dithering mode NIPSON specific hybrid hybrid dithering mode also NIPSON specific only for photographic images The classical dithering is realized by tiling using a screen file They are located in the directory C Program Files NIPSON Common EnhScreens They are files with the scn extension 22 A2 55NS REV2 Using PQF Files Manager List of NIPSON screens to use 480 DPI MACHINES N7000 Standard V75std scn N85 sc
3. and the back verso machine back contrast in a duplex printing system 22 A2 55NS REV2 3 11 3 12 USER GUIDE PQF FILES MANAGER Another use of these curves is to modify slightly images found too black or too pale although in this case the correction by histogram equalization is done more efficiently and automatically For this type of use two identical curves must be defined The correction curves are of bi cubic type The red curve is assigned to the front recto pages the green curve to the back verso pages To define a curve two corresponding parameters are used at two points of the curve These two points are thus handled to draw a curve central point using one of the central scroll bars the left one for the front curve and the right one for the back curve This point can vary from 0 60 to 0 60 per step of 0 02 The point located at the 3 4 of the curve using one of the scroll bars more in the right top bars the left one for the front curve and the right one for the back curve This point can vary from 1 00 to 1 00 per step of 0 02 The Reset to zero buttons allow to reset the parameters defining the curve the curve is then linear and thus inactive 22 A2 55NS REV2 Using PQF Files Manager 3 2 5 The fifth tab Dithering Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Dithering Dithering for photographics Mode for photographics
4. gathered in 5 tabs corresponding to specific phases of the process In each tab the parameters are classified in 2 categories On the one hand the parameters which are always visible because they are usually uses and on the other hand the advanced parameters which are normally hidden but accessible with Advanced button This paragraph Simplified customization explains the usual user parameters and the following paragraph Advanced customization explains the advanced parameters which must be handled with caution Many parameters can be reached by using a horizontal scroll bar In this case the minimum and maximum values are displayed respectively on the left and on the right of the scroll bar the current value of the parameter being in the medium 22 A2 55NS REV2 Using PQF Files Manager 3 2 1 The first tab Main settings Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Dithering Comment Standard Print Quality File for Enh600 for engine with P heads Black and White transfer White threshold s Black threshold s 180 Erosion 1 Erosion 2 None pc nu Morphologic weak Morphologic weak Morphologic standard Morphologic standard Morphologic hard Morphologic hard Standard Standard Continuous Continuous Husking Cancel Figure 3 4 Parameters file Main settings tab Note that the Save bu
5. gray level present on more of S1 255 of its surface and a number of different gray levels lower than Number of gray levels 1 on the 255 possible ones if not it is a graphic image Rule 3 If an image has less different gray levels than Number of gray levels 2 it is a graphic image 22 A2 55NS REV2 3 23 3 24 USER GUIDE PQF FILES MANAGER 3 3 4 The fifth tab Dithering Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Dithering Dithering for photographics Mode for photographics O classical Nipson dispersed hybrid Dithering screen for photographics SSB5pPSR Std12 scn N85 scn N85L scn N85XL scn S106cRFT sen Divisor f ir photograpt Hybrid Index of dispersion threshold 3 1 10 Overlapping dithered dispersed A 10 20 Dithering for graphics Mode for graphics O classical Divisor correction 1 00 Precipit factor Restore default settings creen for graphic Nipson dispersed Divisor for graphics 3 80 Cancel Figure 3 12 Parameters file Dithering advanced tab This last tab Dithering also contains advanced parameters Those only affect the dithering modes Nipson dispersed and hybrid 22 A2 55NS REV2 Using PQF Files Manager Nipson dispersed Dithering Only one parameter In fact one for the dithering of the photographic images and one for the dithering of
6. 0 dpi equipped with type C heads and about 1 3 for the machines 600 dpi equipped with type P heads The increase of this value by reducing the number of dots printed in dispersion gives a more pleasant result Overlapping dithered dispersed 10 by default defines in levels of gray a zone of overlapping between the dithering and dispersion although this overlapping will be overwrite by the dithering A too small value from 2 to 3 is a minimum makes more difficult the starting of the dispersion filter A too large value increases the dispersed zone unnecessarily while reducing the performance Precipit factor 4 by default allows to precipitate in the chemical meaning the dots created by the dispersion filter at the places closest to the place where they would have been printed if the dithered mode was selected This allows to respect the structure of the dithering at the border between dithered and dispersed A value of 2 or 3 increases the structure a value of 100 is considered as negligible 22 A2 55NS REV2 3 25 NI SQN Vos remarques sur ce document Technical publications remarks form Titre Title User Guide POF Files Manager N r f orne unter 22 A2 SENS REV2 ERREURS DETECTEES ERRORS IN PUBLICATION AMELIORATIONS SUGGEREES SUGGESTIONS FOR IMPROVEMENT TO PUBLICATION Vos remarques et suggestions seront attentivement examin es Si vous d sirez une r ponse crite veuillez indiquer ci apr s vo
7. 2 These two lists allow to select 2 erosion processes Erosion is only done on the black pixels of the black and white bitmap and does not affect the images in gray levels By default no erosion parameter value None 2 erosion processes are available allowing either to perform 2 passages of a same type of erosion orto link 2 different erosions 6 kinds of Erosion Morphologic weak Morphologic Standard Morphologic hard Standard Continuous Husking Erosion is used to lighten the text and the lineart images but often has bad effects on the rasterized images for example scanned images from newspapers or views Morphologic Erosion weak standard hard is done on lineart images More the image is bold more Morphologic Erosion must be hard scanned images Standard Erosion is done on text generated by PostScript It can especially be used for small size characters Continuous Erosion respects the continuity of lines joining in diagonal for example on character fonts such as Garamond Light with a printer target in 480 dpi Husking Erosion gives a result a little lighter In some cases of very bold images two successive erosions can be used for example a standard morphologic erosion followed by a standard erosion 22 A2 55NS REV2 Using PQF Files Manager 3 2 2 The second tab Segmentation Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Ditheri
8. Chapter 3 Using PQF Files Manager explains how to use the Manager of files containing the printing quality parameters 22 A2 55NS REV2 1 1 1 2 USER GUIDE PQF FILES MANAGER 22 A2 55NS REV2 2 Installation The Printing Quality Parameters Files Manager is a common component with the CompPsRip CompPcIRip CompAfpTolpds CompPsRipToNpp CompAfpToNpp and CompTiffToNpp composers This component is installed automatically at the time of the composers installation The Printing Quality Parameters Files Manager is in the ihmtool dil DLL installed in the directory Common Bin of the tree structure as indicated below Standard tree structure of the VaryPress PrintServer and Composers applications C Program Files Nipson Installation standard directory or C Nipson Installation standard directory if Windows Vista Common Bin NParamComp5 dll openpmsg dll ihmtool di1 EnhConfig EnhConfigClr pqf EnhParam pqf EnhScreens scn Nipson_HarlequinRIP8 xxx nipson exe dll CompPsRipToNpp CompPsRipToNpp exe CompAfpToNpp CompAfpToNpp exe AfpToNpp exe PrintServer VPServer exe The directories Common EnhConfig Common EnhParam Common EnhScreens are used by the Printing Quality Parameters Files Manager like by the images processing functions at the jobs composition time by the composers The directory Common EnhConfig contains a default printing quality p
9. NIPSON User Guide USER GUIDE FILES MANAGER NI SQN User Guide USER GUIDE FILES MANAGER SOFTWARE Document release May 2007 Creation Revision V01 00 00 March 2008 Modification Revision V01 00 01 April 2009 Modification Revision V01 00 02 22 A2 55NS REV2 NIPSON 2009 All rights reserved RIP Harlequin is a Global Graphics trademark Suggestions and criticisms concerning the form content and presentation of this manual are invited A form is provided at the end of this manual for this purpose This document is issued for information purpose only It does not involve NIPSON responsibility in case of damage resulting from its implementation Corrections or modifications will be made without prior notice and brought to the knowledge of subscribers by appropriate updating il 22 A2 55NS REV2 Preface This document describes the Printing Quality Parameters Files Manager used by different NIPSON composers These parameters files are used by the composers e CompPsRip e CompPciToSdp e CompAfpTolpds e CompPsRipToNpp e CompAfpToNpp e ComplTiffToNpp 22 A2 55NS REV2 iii USER GUIDE PQF FILES MANAGER 22 A2 55NS REV2 Table of contents Pr face AAA sua ili 1 Introduction eh aiaa A a a aaia aaa a an aaan iniaa 1 1 2 A e UE 2 1 3 Using PQF Files Manager sms 3 1 3 1 PQF Files Manager acoess
10. R 3 3 3 The third tab Histogram Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Dithering Validate photographics and graphics separation Walidate histogram equalization for photographics C Validate histogram equalization for graphics Low threshold High threshold 4 Gray ratio 1 Gray ratio 2 Number of gray levels 1 Number of gray levels 2 Restore default settings Cancel Figure 3 11 Parameters file Histogram advanced tab This third tab Histogram contains 4 advanced parameters Gray ratio 1 associated with Number of gray levels 1 and Gray ratio 2 associated with Number of gray levels 2 define the thresholds which allow to decide if an image is Photographic or Graphic type They have been defined experimentally 3 22 22 A2 55NS REV2 Using PQF Files Manager Principle for using these parameters Two thresholds are calculated S1 Number of whole dots in image Gray ratio 1 S2 Number of whole dots in image Gray ratio 2 We also have two values Number of gray levels 1 of about 15 and Number of gray levels 2 of about 10 and such as Number of gray levels 1 gt Number of gray levels 2 Three rules are applied Rule 1 The gray level of an image should be present on more S2 255 of surface to be taken into account in the 2 following rules Rule 2 A photographic image should not have a specific
11. arameters file The directory Common EnhParam contains the printing quality parameters file of the user The directory Common EnhScreens contains the screening files used for the images dithering 22 A2 55NS REV2 2 1 2 2 USER GUIDE PQF FILES MANAGER 22 A2 55NS REV2 3 Using Files Manager 3 1 PQF FILES MANAGER ACCESS In the CompPsRip CompPcIRip CompAfpTolpds CompPsRipToNpp CompAfpToNpp and CompTiffToNpp composers the access to PQF Files Manager is done by starting the composer in Composers Manager mode and by clicking the Print Quality Files button i AFP TO NPP Composers Manager Logical Composers List Logical name Comment AfpNppi Composer AfpNppi on port 1310 Configuration Edition Mipson PrintServer Access Composition Parameters Print Quality Parameters Figure 3 1 CompAfpToNpp in Composers Manager mode 22 A2 55NS REV2 3 1 3 2 USER GUIDE PQF FILES MANAGER One can access it directly at the composition parameters file edition level in the Imposition Parameters tab by clicking PQF files Manager button Composition parameters file 24x18Tedo00 Line Data Parameters Personalization Request Parameters Main Parameters Imposition Parameters AFP IPDS Parameters Bitmap processing Print Quality B rameters File NETS EIE PQF files Manager Edit the file C Advanced Trimming Figure 3 2 Imposition Pa
12. ces are placed in a traces file of the composition module of the composer in the directory C Program Files Nipson Compxxxx Traces 22 A2 55NS REV2 3 19 USER GUIDE PQF FILES MANAGER 3 3 2 The second tab Segmentation Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Dithering Validate segmentation Number of maximum segments Horizontal margin Unit between segments 10 picas picas Vertical margin between O cm segments 100 picas O inches Left horizontal margin between segments 3 picas Restore default settings Figure 3 10 Parameters file Segmentation advanced tab This second tab Segmentation contains 4 advanced parameters Number of maximum segments The number of maximum segments in a page allows to limit a page cutting in a reasonable number of images If this number is exceeded the segmentation is cancelled for the page in progress a 3 20 22 A2 55NS REV2 Using PQF Files Manager message which does not stop the process is displayed the following processing are only made on one segment gathering all images of the page three others parameters Horizontal margin between segments Vertical margin between segments and Left horizontal margin between segments allow to define concatenation thresholds of segments which are isolated during the segmentation 22 A2 55NS REV2 3 21 USER GUIDE PQF FILES MANAGE
13. d tab inserer 3 18 Figure 3 10 Parameters file Segmentation advanced tab ss 3 20 Figure 3 11 Parameters file Histogram advanced tab ss 3 22 Figure 3 12 Parameters file Dithering advanced tab ss 3 24 22 A2 55NS REV2 vii USER GUIDE PQF FILES MANAGER viii 22 A2 55NS REV2 1 Introduction The control of the image processing sequence integrated in the CompPsRip CompPcIRip CompAfpTolpds CompPsRipToNpp CompAfpToNpp and CompTiffToNpp composers is made from parameters collected in files which will be associated to the job processing at composition parameters level or at Page Setup level in the case of CompPsRip A same parameters file can be used in several composition parameters files or Page Setup The parameter files are text files with the extension pqf This document describes how to create and manage these parameters files with pqf extension The NIPSON image processing sequence starts from a bitmap in gray levels 256 gray levels The process consists to transform this bitmap into a black and white bitmap by applying various processes These main processes are the histograms correction of the images contained in this bitmap the images dithering according to specific modes adapted to the print engine of NIPSON printers Contents of this document Chapter 2 Installation describes how is installed this component common with different NIPSON composers
14. efault settings button allows to restore the default values of the tab advanced parameters 22 A2 55NS REV2 3 17 3 18 USER GUIDE PQF FILES MANAGER 3 3 1 The first tab Main settings Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Dithering Comment Standard Print Quality File for Enh600 for engine with P heads Black and white transfer White threshold lt ul si 180 Black threshold Erosion 1 Erosion 2 None TIEREN Morphologic weak Morphologic weak Morphologic standard Morphologic standard Morphologic hard Morphologic hard Standard Standard Continuous Continuous Husking d Traces level O No traces Simplified traces Normal traces Full traces Figure 3 9 Parameters file Main settings advanced tab This tab contains only one advanced parameter It enables traces of the image processing allowing diagnostics in case of problems during the process There are 3 levels of traces Simplified The trace file contains The page dimensions The running time of each sub process 22 A2 55NS REV2 Using PQF Files Manager normal The trace file contains in addition The detail of parameters used for the process The images table with its dimensions type etc full The trace file contains in addition The gray level histogram of each image The corrected histograms The tra
15. image into account e Low threshold This parameter is the threshold from which the gray levels are assigned during the histogram equalization Its default value is 2 Its minimal value cannot be lower than the White threshold of the tab Main Settings This threshold allows in fact to exclude the low gray levels from the correction of the gray levels Those are treated in a linear way without correction e High threshold This parameter is the threshold under which the gray levels are assigned during the histogram equalization Its default value is 250 Its maximal value cannot be higher than the Black threshold of the tab Main Settings This threshold allows in fact to exclude the high gray levels from the correction of the gray levels Those are treated in a linear way without correction 22 A2 55NS REV2 Using PQF Files Manager 3 2 4 The fourth tab Contrast Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast gt D D D E lighter origina gray level _ _ front contrast back contrast Figure 3 7 Parameters file Contrast tab This fourth tab Contrast allows to define two supplementary histograms correction curves These curves can be used in two ways The first use allows to correct slightly and only on the images in gray levels photographic or graphic the contrast between the front recto machine front contrast
16. is in gray levels in the page is considered then as only one object on which the same histogram processing and dithering processing will be applied If a page does not contain image the segmentation does not do anything and that does not spend time It is the same for histogram and dithering processing 22 A2 55NS REV2 Using PQF Files Manager 3 2 3 The third tab Histogram Print Quality parameters DemoEnh600Stdp Main settings Segmentation Histogram Contrast Dithering Validate photographics and graphics separation Walidate histogram equalization for photographics C Validate histogram equalization for graphics Low threshold High threshold Cancel Figure 3 6 Parameters file Histogram tab This third tab Histogram allows to define the following parameters e Validate photographics and graphics separation For each image separated as indicated previously the histogram and the cumulated histogram of the gray levels are calculated these calculations are made only if necessary if separation and or equalization normalization are required 22 A2 55NS REV2 3 9 3 10 USER GUIDE PQF FILES MANAGER The separation allows to distinguish if it is a photographic type image whose gray levels are continuous contone a graphic type image comprising only some distinct gray levels The separation of the images in gray levels in two categories allows to apply different proces
17. n Light V75lit scn N85L scn Very Light N85XL scn 600 DPI MACHINES with type C heads 85 Lpi 96 Lpi 106 Lpi Medium Dark Bayer S96cB scn Bayer S96cBmod Dark Modified scn S96cBmod scn Random S SCRFT S96cHRFT scn S96cRP scn 51 in Pseudo S96cPSR Dark8 S96CPSR_MDark12 S96cPSR_Std16 S96cPSR Light20 Random y With this mode you use all screens But we use it generally with the photographic image screen 600 DPI MACHINES with type heads 96 Lpi 106 Lpi Standard Light Bayer S96pB scn Bayer Modified S96pBmod Dark s96pBmod sen Pseudo S96pPSR Dark8 S96pPSR Std12 S96pPSR Light16 Random Scn Scn With this mode you can use all screens But we use it generally with the photographic image screen The choice of a screen is a little subjective One can then proceed in the following way For the 480 dpi machines the choice is limited Choose the V75std or N85 standard screen according to the machine and pass to the paler versions if the result is not appropriate For the 600 dpi machines choose first S96CPSR_Std16 screen or S96pPSR Std16 screen according to the printer heads for documents with photographic images or S96cBmod screen or S96pBmod screen for documents with grayed zones Other screens can then be tested if this first choice is not satisfactory See also the documentation ImageGuide_Us pdf in the CD for more detailed information The Ni
18. ng Validate segmentation Figure 3 5 Parameters file Segmentation tab This second tab Segmentation contains only one parameter Validate segmentation which allows to enable or disable the segmentation In the NIPSON image processing sequence it can exist 5 types of different objects in a page photographic images in gray levels named Photographics in the dialog box A photographic image contains many gray levels represented in a continuous way 22 A2 55NS REV2 3 7 3 8 USER GUIDE PQF FILES MANAGER graphic images in gray levels named Graphics in the dialog box A graphic image contains few gray levels strongly represented The colored text zones converted into gray levels belong to this category line art images in black and white dithered images in black and white text in black and white The black and white objects line art images dithered images text in black and white are in fact separated in the first phase of the processing seen in Main Settings Processing of the black and white pixels with to 2 thresholds and Erosion The segmentation allows simply to insulate in the page the objects in gray levels either photographic images or graphic images The segmentation must be used to apply different processes to the various photographic and graphic images in order to optimize the printing By default segmentation must be validated If the segmentation is disabled all that
19. pson dispersed dithering is the second dithering mode It is a dispersed mode using a Floyd Steinberg type filter This filter is modified and adapted to NIPSON printers 22 A2 55NS REV2 3 15 3 16 USER GUIDE PQF FILES MANAGER This dithering mode does not use any screen thus in this case the list of the screens is grayed This mode doesn t be used in the case of 480 dpi machines The hybrid dithering is the third dithering mode available This dithering mode uses a combination of the two preceding dithering modes a classic dithering with a screen file for the higher gray levels a Nipson dispersed dithering for the low gray levels This dithering mode uses thus a screen which must be selected as for the classic dithering The transition between dispersed and framed is done automatically on a gray level value preset in the screen used Other values are possible but are only accessible with advanced parameter This mode doesn t be used in the case of 480 dpi machines 22 A2 55NS REV2 Using PQF Files Manager 3 3 ADVANCED PARAMETERS As explained in previous paragraph 4 tabs of dialog box Print Quality parameters contain an Advanced button given access to the advanced parameters which are normally hidden This paragraph draft about these advanced parameters These advanced parameters must be handled with caution They are reserved to expert to solve specific problems Note that in each tab a Restore d
20. rameters tab PQF files Manager 22 A2 55NS REV2 Using PQF Files Manager This command opens the dialog box Print Quality parameters Manager for NIPSON Printers Print Quality parameters Manager for Nipson printers List of Print Quality parameters files DemoEnh600Stde Standard Print Quality File for Enh600 for engine with C I DemoEnh600Stdp Standard Print Quality File for Enh600 for engine with P Enh600cRFT Print Quality File for Enh600 SS6cRFT ErosMorphHybrid Erosion Morphologic Dithering Hybrid ScanNoSeg For Scanned images No Seg Black threshold230 lt gt New dette Cancel Figure 3 3 List of Print Quality parameters files This window displays the list of parameters files which exist without the pqf extension with an associated comment It allows to create delete and edit the parameters files To create a new parameters file use the New button In this case a default parameter setting is used to initialize the parameters for a new file To create a new parameters file it is also possible to select an existing file and to create a copy of these parameters using the Copy button The Edit button allows to modify the selected file The Delete button allows to delete the selected file 22 A2 55NS REV2 3 3 USER GUIDE PQF FILES MANAGER 3 2 SIMPLIFIED CUSTOMIZATION 3 4 The parameters dialog box appears as indicated in the figure hereafter The parameters are
21. sing Equalization of the histograms and Dithering to each category Principle of separation If a gray level is present in the image on more than one thousandths of the total number of points it is counted as a valid gray level If the image comprises less than 10 valid gray levels or if it comprises less than 15 gray levels with at least one in a number higher than one fiftieth 2 296 of the total number of points it is a graphic image else it is a photographic image If the separation is disabled all the images in gray levels in the page are considered by default as photographic images In this case the data processing sequence of the graphic images is disabled histogram equalization and Dithering of the graphic images e Validate histogram equalization for photographics e Validate histogram equalization for graphics These 2 parameters allow to enable or disable the histogram equalization respectively for photographic images and graphic images By default histogram equalization is disabled for the photographic images histogram equalization is disabled for the graphic images The histogram equalization or normalization allows to correct the contrast especially on the photographic images but possibly on graphic images That consists to assign the value of the gray levels of the image in the range of gray levels available between Low threshold and a High threshold by taking their importance in the
22. the graphic images Divisor for photographics and Divisor for graphics This divisor is in fact a factor of correction of the gray levels which take into account the continuous average gain of the dispersion filter The usual values are about from 6 0 to 7 0 for the machines 600 dpi equipped with type C heads and about from 3 5 to 4 5 for the machines 600 dpi equipped with type heads The increase of the divider gives the result of the dithering paler Hybrid Dithering 4 advanced parameters are associated the hybrid dithering In a general way the default values of these advanced parameters give a correct result Index of dispersion threshold defines on which gray level is made the transition between dispersed and dithered For that the screens contain a table of the gray levels where can be made the transition dithered dispersed Index of dispersion threshold is an index on this table In a practical way the values 1 or 2 are used which corresponds for example respectively to the gray levels 23 and 50 in a S96cRFT screen Divisor correction In hybrid dithering the divider is automatically calculated from screen parameters and according to the gray level to the corresponding index of the dispersion threshold However this divider can be corrected if necessary with this parameter The experiment shows that values from 0 7 to 1 5 even up to 2 0 are usable values An usual value is about 1 0 for the machines 60
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24. tton in this dialog box is replaced by a Save As button when it is a new parameters file Access by New or Copy This first Main settings tab allows to define the following parameters e Comment it allows to associate a comment to the parameters file This comment appears in the parameters files list of the dialog box Print Quality parameters Manager for 22 A2 55NS REV2 3 5 3 6 USER GUIDE PQF FILES MANAGER NIPSON Printers and it makes the identification of the parameters file better The maximum length of this comment is 127 characters e White threshold In the gray level scale any value strictly lower than this parameter will be treated as a white pixel 0 By default this threshold is 1 indicating that only the gray level value 0 is a white pixel It is necessary to take a white threshold higher than 1 to process images having a background for example images coming from an imperfectly calibrated scanner The background lower than the white threshold will be white e Black threshold In the gray level scale any value higher or equal to this parameter will be treated as a black pixel 1 By defect this threshold is 255 indicating that only the gray level value 255 is a black pixel It is necessary to take a black threshold lower than 255 if the black areas of the images are not perfectly black The choice of a black threshold of about 240 will transform these zones into black areas e Erosion 1 and
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