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Xerox 721P87491 Printer User Manual

1. orientation Output Image A Slow Slow Rotated A A gt Fast Output Output without rotation with rotation The scan order of an image relative to the content of the image is not important It is important that the scan order of the image in the desired orientation is relative to the scan order of the page There are circumstances during which a transformation cannot be avoided by any ordering of image data such as when the image sides are not parallel to the sides of the paper or when the image is skewed but for many cases you can avoid a rotation by ensuring that the data in the image is in the correct order Ensuring optimum image data order is complicated by the fact that the rotations are not tied to the use of the rotate operator ina PostScript program or to implied rotations in the image to user space transformation The transformations in the figures above are automatically performed on data by DocuPrint NPS when required as part of rendering The transformations specified in PostScript are part of a specification of the desired position of an image in terms of the default user coordinate system The following example shows the choice of row or column to describe an arbitrary one dimensional slice of an image that depends on the viewpoint XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 29 POSTSCRIPT Figure 2 10 Image pixel sequence example Image 00000000 00011000
2. DocuPrint supports most PCL 5 fonts Table 1 2 lists the internal HP LaserJet compatible fonts installed with the system e One bitmap font e 45 scalable fonts 35 Intellifont FAIS typefaces 10 TrueType typefaces PCL fonts may be downloaded within a PCL job Note The DocuPrint NPS PCL 5e and 5c interpreters support use J of downloaded PCL fonts or macros by setting the proper parameter using the Change PCL Parameters command Refer to the Guide to Configuring and Managing the System chapter Setting system defaults 7 PCL Intellifont FAIS typefaces and PCL bitmap fonts may be permanently installed using the Install PCL Fonts From Floppy command PCL bitmap fonts must be in the PCL soft font format for HP LaserJet printers A PCL bitmap font contains a font header and a set of character definitions The PCL format 0 zero and format 20 font headers are supported for PCL bitmap fonts Refer to your Hewlett Packard PCL 5 printer language publications for details on the font header and character descriptions Installation of other font types is not supported For MICR systems a special DocuPrint NPS MICR font floppy is available It contains the PCL bitmap font named E13B required for MICR applications See the Guide to Configuring and Managing the XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 1 3 PCL 5 System chapter on MICR Printing for more information Refer also to the Gener
3. Variable Data Intelligent PostScript PrintWare or VIPP formerly XGF provides a facility for the easy integration of data forms and images from host applications to the PostScript environment VIPP offers the following benefits e Allows imaging and data processing applications to produce an easy to implement data stream that is PostScript compliant e Provides access to optimal performance e Keeps applications independent of PostScript and printer evolution Brings all the power of PostScript to production printing without requiring a heavy investment in PostScript training e Provides a cost effective solution for continuing to print host based applications VIPP software is installed with the standard DocuPrint NPS system and provides PostScript macro definitions KGF commands to the PostScript interpreter Normal PostScript jobs print as always while jobs that include VIPP commands can take advantage of the power offered by VIPP Refer to the Guide to Configuring and Managing the System for more information on VIPP installation The VIPP package provides the following two modes of operation e Native mode Provides a set of easy to use operators bundled as a PostScript program that enables the quick development of host based production printing applications e Line mode Enables formatting and extensive print job control of host supplied ASCII or EBCDIC data with minimal change for host applications Line mode
4. e Never use a ground adapter plug to connect equipment to an electrical outlet that lacks a ground connection terminal e Always place equipment on a solid support surface with adequate strength for its weight e Always use materials and supplies specifically designed for your Xerox equipment Use of unsuitable materials may result in poor performance and may create a hazardous situation e Never move either the printer or the Printer Controller without first contacting Xerox for approval e Never attempt any maintenance that is not specifically described in this documentation e Never remove any covers or guards that are fastened with screws There are no operator serviceable areas within these covers s Never override electrical or mechanical interlocks e Never use supplies or cleaning materials for other than their intended purposes Keep all materials out of the reach of children e Never operate the equipment if you notice unusual noises or odors Disconnect the power cord from the electrical outlet and call service to correct the problem If you need any additional safety information concerning the equipment or materials Xerox supplies call Xerox Product Safety at the following toll free number in the United States 1 800 828 6571 For customers outside the United States contatct your local Xerox operating company XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES Table of contents Laser safety
5. 00111100 OLLIE T 10 00011000 00000000 Sequence A origin top left row scan order 0o00000000001100000111100011111 100001100000000000 Sequence B origin bottom right column scan order 000 i o 0 0 00 Be ONO OF a BT 1 0 OE 0 000 0 00112000031200000000 0 Regardless of which scan order is chosen the scan proceeds in one direction called the fast scan direction through each parallel slice in turn progressing through the slices in a direction called the slow scan direction In sequence A the fast scan direction is left to right and the slow scan direction is top to bottom For sequence B the fast scan direction is bottom to top and the slow scan direction is right to left The terms left right bottom and top only have meaning based on the orientation of the image on the page When DocuPrint NPS executes a PostScript program the principal product for each page is an image just like the images that can be incorporated into PostScript programs The image data is transferred to the imaging hardware as a sequence of values in laser scan order 2 30 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Considerations The scan order of an image relative to the content of the image is not important It is important that the scan order of the image in the desired orientation is relative to the scan order of the page There are circumstances when a transformation cannot be avoided
6. chapter provides specific information about the support available Refer to your Hewlett Packard PCL 5 printer language publications for more information on PCL There is a DocuPrint NPS Change PCL Parameters command that allows you to configure your PCL printing environment Refer to the Guide to Configuring and Managing the System Utility commands for more information Note In PCL commands referenced in this chapter the sign is replaced by a number DocuPrint Models 4050 4090 4850 and 4890 NPS provide a resolution of 300 dots per inch dpi and Models 92C 96 4635 and 180 NPS provide resolution of 600 dots per inch If your PDL contains scalable fonts or simple vector graphics and line art generated at 600 dpi the differences in printing at 300 or 600 dpi are subtle However if your PDL contains bitmaps with a resolution of 600 dpi printing at 300 dpi causes a degradation in image quality To preserve image quality regenerate the bitmaps at the printer resolution of 300 dpi or regenerate them as simple line art The 600 dpi printers can accept jobs with resources in either 300 or 600 dpi Note Though you can print documents containing 300 dpi bitmaps on a 600 dpi printer there can be an impact on performance as the printer processes the image for 600 dpi printing J XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 1 1 PCL 5 Note For PCL jobs DocuPrint NPS supports 300 and 600 d
7. forces new sheet forces new sheet Feed from upper tray lt ESC gt amp I1H forces new sheet forces new sheet Feed from manual feeder lt ESC gt amp l2H forces new sheet forces new sheet Feed from lower tray lt ESC gt amp I4H forces new sheet forces new sheet Number of copies command lt ESC gt amp l X forces new sheet no new sheet XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES PCL 5 PCL Job Separation command DocuPrint implements the Paper Source command by corresponding the number specified in the command to the correlating media in the media list of the Media document attribute Therefore the Feed from upper tray command specifies the first media in a media list in the document attribute and the Feed from lower tray command specifies the fourth media in a media list in the document attribute Refer to the PCL Paper Source command section for more information For information on mixed plex jobs for Models 96 4635 and 180 see the chapter Mixed plex applications in the Guide to Managing Print Jobs PCL uses the Job Separation command lt ESC gt amp I1T to separate distinct portions of the output by offsetting a set of sheets in the output from a succeeding set of sheets There is a short description of the PCL Job Separation command in the HP documentation This command is only supported on the HP LaserJet IIISi HP reco
8. standard PostScript undefined command message and flushes the master to end of file Stroke DocuPrint NPS uses the scan conversion rules to control the PostScript painting operators stroke fill clip and image The scan conversion process and rules are not defined as part of the PostScript language They are subject to variations depending on algorithms used in different PostScript printing devices to achieve the most accurate rendition possible The sections below describe the stroke and fill operators Stroke refers to painting a line that follows the current path is centered on the path and has sides parallel to the path segment Path includes a thickness set by the operator setlinewidth DocuPrint NPS turns on any device pixels whose centers lie within the width of the path to be stroked The pixels whose centers lie outside of the width of the path are turned off 2 18 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Figure 2 4 Stroke function Thickness of line The top illustration above shows four columns of three pixels on the printing device The dashed lines intersect at the center points of the device pixels or dots The columns from left to right are designated as columns 1 2 3 and 4 The lower illustration builds on the top illustration by adding two vertical line segments that will be stroked The sides of the line to be stroked are
9. 0 lines currentfile lt lt Uncompressed false K 1 EndOfLine false EncodedByteAlign false Columns bpl Rows lines EndOfBlock false BlackIs1 true gt gt CCITTFaxDecode filter useMask imagemask image ifelse binary G4 data goes here 3 3 3 S S S end of G4 data restore showpage sEnd of Example 2 34 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Figure 2 14 Actual PostScript print 9 PS Adobe 3 0 S Emulation ccitt sLanguageLevel 2 Requirements duplex off Requirements numcopies 1 Requirements staples none DocumentMedia letter 612 792 75 white DocumentMedia white 612 792 75 white EndComments BeginSetup lt Duplex false NumCopies 1 PageSize 612 00 792 00 gt setpagedevice SEndSetup sPage 1 1 ave 0 0000 792 0000 translate 612 4800 792 0000 scale do_image currentfile 80 string readline pop pop image currentfile read 37 eq exit if exit ifelse loop def 2552 3300 1 2552 0 0 3300 0 0 currentfile lt lt K 1 Columns 2552 Rows 3300 BlackIs1 false gt gt CCITTFaxDecode filter do_image CCITT G3 G4 Data AP ANP oA oP WP oA oA OP oe AP oP o ol oe V NA oP oe n PageTrailer showpage XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 35 POSTSCRIPT 2 36 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 3 VIPP
10. 17 rotate 2 29 2 32 scale 2 32 SetCacheDevice 2 25 setfileposition 2 17 setflat 2 20 setgray 2 22 setlinewidth 2 18 2 20 setscreen 2 25 2 26 stroke 2 18 2 19 optimized scaling 2 32 orientation 2 25 2 26 2 28 ozone iii P padding bounding box 2 25 Page Size command PCL 1 9 paper sizes acceptable 1 3 Paper Source command implementing 1 8 Paper Source command PCL 1 9 path limits 2 25 pathforall operator 2 26 PCL custom drivers for 5c 1 14 drivers for 5c 1 14 PCL 5 coding recommendations 1 12 documentation xii resolution 1 2 PCL 5c coding recommendations 1 13 PCL 5c support 1 12 PCL commands supported 1 5 1 12 PCL Copy command 1 6 1 7 PCL interpreter 1 11 PCL Offset Registration command 1 11 1 12 PCL Paper Source command 1 9 PCL tray assignment 1 9 pixels painting 2 18 2 21 PJL commands 1 5 plex attribute 1 7 plex PostScript simulated mixed 2 17 ports 2 14 post enhancement 2 12 PostScript comment format 2 21 documentation xi EOF delimiters 2 14 2 16 extensions proprietary 2 13 fonts listing 2 2 Type 1 2 2 2 5 jobs delimiting 2 14 Level 2 operators 2 17 master 2 21 Printer Controller operations 2 18 printer description see PPD virtual memory 2 16 2 25 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES INDEX 3 INDEX PPD files 2 23 specifications 2 23 pre enhancement 2 12 print engine write black 2 12 2 1
11. PAGE DESCRIPTION LANGUAGES 2 17 POSTSCRIPT Printer Controller operations Scan conversion details The DocuPrint NPS Printer Controller operates as follows e PostScript stdout messages are printed on the JOB MESSAGES AND ERRORS page DocuPrint PostScript prints error messages directed to stderr on the JOB MESSAGES AND ERRORS page as well e PostScript font substitution error messages appear on the JOB MESSAGES AND ERRORS page only when the requested font is not present and is not one of the DocuPrint base 51 font set e DocuPrint does not emulate the serial communications handling aspects of the LaserWriter Notably DocuPrint syntactically treats control D and control Z as literal characters in ASCII strings and binary data not as end of file delimiters Also DocuPrint does not strip high bits from character string data Instead DocuPrint treats all input bytes as valid PostScript e DocuPrint handles ASCII or binary input transparently and does not require two input modes e DocuPrint wraps each PostScript document with a save and restore to ensure that documents are independent DocuPrint NPS implements the exitserver operator to permit modifying PostScript virtual memory within a document but not across documents e DocuPrint performs standard PostScript error handling when it encounters LaserWriter specific operators that DocuPrint NPS does not implement The error handling process produces a
12. PostScript masters that use proprietary printer features may cause appearance inconsistencies between different PostScript printers XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 13 POSTSCRIPT Control D as binary data and end of job The fact that control D can be a valid PostScript end of file EOF delimiter in one communications protocol and invalid in another creates a paradox for PostScript printers that must accept jobs created for either communications mode without any indication of which communications mode was used The recommended solution is described in Solution to control Z and control D problems How PostScript jobs are delimited separated from each other ina continuous stream of jobs is not simple Remember that the actual PostScript interpreter has no concept of a job There is no PostScript job end operator The job server which is external to the interpreter must make the job begin and job end determination and act accordingly It does this by considering a PostScript job to be a simple byte stream input file When end of file EOF is reached the job server restores the PostScript state for the next input file job The way input files or jobs are sent to a PostScript printer depends on the communications protocol used to transfer the PostScript document to a PostScript printer For example when a LaserWriter is connected to an Apple Macintosh over the AppleTalk serial communi
13. a specific order relative to the paper to produce the output image For DocuPrint the fast laser scan direction is parallel to the long edge of the paper and the slow laser scan direction is parallel to the short edge of the paper The fast scan direction is in the direction of increasing y coordinates and the slow scan direction is in the direction of increasing x coordinates in the PostScript default user space with the y axis corresponding to the long edge of the paper Refer to the Adobe PostScript Language Reference Manual for more information When an image is used in a document it is placed in a specific orientation on a page The orientation of fast and slow scan directions for the image relative to those for the entire output page is important If the directions for the image do not match the directions for the page extra processing must be done at the printer to reorder the image data The most time consuming processing is rotation shown in the figures below using US Letter paper size Figure 2 8 Image orientation mismatch A Printer s paper orientation Output R Image gt Fast Fast Rotated Slow Output Output without rotation with rotation 2 28 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Figure 2 9 Image orientation mismatch B Printer s paper
14. beam is completely enclosed during all modes of customer operation The laser danger labels on the system are for Xerox service representatives and are on or near panels or shields that must be removed with a tool DO NOT REMOVE LABELED PANELS OR PANELS NEAR LABELS ONLY XEROX SERVICE REPRESENTATIVES HAVE ACCESS TO THESE PANELS This label is inside the left door on the machine frame just above the directions for clearing a jam in area 4 Ozone information This product produces ozone during normal operation The amount of ozone produced depends on copy volume Ozone is heavier than air The environmental parameters specified in the Xerox installation instructions ensure that concentration levels are within safe limits If you need additional information concerning ozone call 1 800 828 6571 to request the Xerox publication 600P83222 OZONE Operation safety Your Xerox equipment and supplies have been designed and tested to meet strict safety requirements They have been approved by safety agencies and they comply with environmental standards Please observe the following precautions to ensure your continued safety e Always connect equipment to a properly grounded electrical outlet If in doubt have the outlet checked by a qualified electrician XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES iii Warning Improper connection of the equipment grounding conductor may result in risk of electrical shock
15. commands are modeled after Xerox LCDS commands coupled with a growing list of third party tools available on the market today enables the simple migration of LCDS print jobs to the PostScript environment This capability is often needed when you are downsizing from a centralized IM shop to a client server architecture An adaptation to Line mode also allows formatting and job control of field delimited database files supplied from multiple hosts XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 3 1 VIPP Functionality Operating environment In native mode an application program uses the following operators to control how data is placed on a page e Orientation P L J e Font selection scaling color gray level and outline e Absolute placement coordinates e Text alignment left right and center e Rotation to any angle e Linespacing e PostScript forms merge several per page may be produced by virtually any PostScript emitter e Image merge including TIFF header interpretation scaling rotation and CCITT Group 3 and 4 e Decomposition Service forms merge In line mode you must place a job description ticket JDT call at the start of the data to initiate VIPP in line mode The JDT describes the layout of the printed job and includes the following operators e Orientation e Margins e Characters per line CPI and lines per page LPI e Font selection including automatic scali
16. dictionary key value pairs string 262144 or 2 8 Maximum number of characters in a name file See File operators and standard devices _ userdict 2000 Capacity of UserDict operand stack 5000 Maximum depth of the operand stack dict stack 50 Maximum depth of the dictionary stack exec stack 250 Maximum depth of the execution stack interpreter level Variable Maximum number of recursive invocation of the interpreter save level 31 Maximum number of active saves gsave level 31 Maximum number of active gsaves path 1500 See Path limits dash 65536 Maximum elements in dash pattern VM Approximately 4 megabytes Maximum size of the virtual memory in bytes systemdict 256 Maximum capacity of System Dict errordict 28 Maximum capacity of Error Dict File operators and standard devices When stdin is the filename for the file operator DocuPrint NPS does not create a new file object For example the following PostScript segment uses stdin to open a file stdin r file stdin device open a file for reading from the DocuPrint NPS returns the file object for stdin created at initialization time which is used for reading the PostScript master Therefore PostScript masters should avoid doing a closefile on stdin because this action closes the file object that is used by the PostScript interpreter to read the PostScript master Although the use of the operator file on stdin is common other PostScript operators such
17. iii Ozone information iii Operation safety iii Introduction ix About this guide ix Contents ix Conventions ix Related publications xi Related information xi PostScript publications xi HP PCL 5 publications xii VIPP publication xii 1 PCL5 1 1 Maintaining image quality 1 1 PCL 5 media support 1 3 PCL 5 font support 1 3 PCL command support 1 5 PJL commands 1 5 PCL Copy command 1 5 PCL Duplex commands 1 7 PCL Job Separation command 1 8 PCL media selection 1 9 PCL Paper Source command tray assignment 1 9 Precedence in selecting media 1 10 PCL Output Bin command 1 11 PCL Offset Registration commands 1 11 PCL 5 coding recommendations 1 12 PCL 5c support 1 12 PCL 5c coding recommendations 1 13 PCL 5c functions not applicable to DocuPrint NPS 1 13 Driver recommendations for PCL 5c 1 14 Limitations for custom PCL 5c drivers 1 14 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES v TABLE OF CONTENTS 2 PostScript 2 1 Implementation dependent operations 2 1 Floating point arithmetic and math operators 2 1 Coordinate system default matrix 2 1 Fonts 2 2 Loading fonts 2 3 User defined fonts 2 3 Type 1 fonts 2 4 Using Adobe Type 1 fonts 2 4 Producing Type 1 fonts for use with DocuPrin
18. indicated with solid bold lines The line to right has its left side to the left of the center point of the third column of pixels and has its right side to the right of the center point of the fourth column Because the center points of the third and fourth columns of pixels are within the thickness of this line all six pixels are turned on indicated in this picture by cross hatching the pixels Contrast this with the line on the first and second columns of pixels Because the center point of the second column falls outside its boundaries only the first column is turned on Fill The Fill function controls the shapes zero width lines curved shapes and image operators Shapes A shape is a path to be painted with the current color or with a pattern To paint shapes insideness computations need to be performed These determine which pixels fall inside and outside the shape During fill the pixels whose centers lie within the inside boundaries of the shape are turned on Those whose centers lie outside the shape are turned off Some PostScript creators describe long very thin rectangular fill regions in the masters for example boundaries of boxes or rules DocuPrint selects some of those shapes and treats them as thin paths that are stroked to ensure that they are imaged painted XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 19 POSTSCRIPT Zero width lines strokes Zero width
19. lines are lines that have a line width set to zero by the PostScript master These lines may not image The best method is to specify the sizes of the hairline you want such as 24 setlinewidth instead of O setlinewidth Figure 2 5 Example illustrating fill function Thickness Py snr Me re nee of Line Center ge 2 Points of e 7 Pixels This illustration shows four rows of five pixels on the output device The center points of the device pixels are at the cross sections of the dashed lines The horizontal lines to be filled are indicated by two solid bold line segments per horizontal line The horizontal line at the top contains the center points of the second row of pixels therefore the pixels are turned on by the imager This is shown by cross hatching the pixels that are turned on The horizontal line at the bottom of the picture does not contain the center points of the fourth row of pixels therefore no pixels are turned on and the line is not visible Curved shapes The flatness parameter is used to set the accuracy with which curves are rendered on the output device Because DocuPrint does not use curve flattening conversion of curves to line segments in graphic rendering the parameter for the operator setflat has no effect on the smoothness of curves Images In DocuPrint the region of the device space to be painted is determined according to the f
20. not restored before the next job This means that the next job environment is not clean which may or may not cause problems PostScript VM may also run out since VM is not restored by control D Note that all Xerox PostScript products do restore VM at the end of their input file so single PostScript jobs per input file are always handled correctly e Some of the PostScript jobs execute exitserver which stays in effect until EOJ Because the control Ds are not interpreted as EOJ subsequent non exitserver job definitions become permanent which could consume all of the PostScript VM or cause other PostScript problems e A job executes code that flushes the input data up to EOJ Because the control D is not interpreted as EOu it does not stop the flushing Therefore the rest of the PostScript jobs in the input file are ignored 2 16 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT DocuPrint NPS implementation of PostScript Level 2 Simulated mixed plex DocuPrint NPS implements the PostScript Level 2 operators it conforms to the PostScript Language as defined in the PostScript Language reference manuals DocuPrint does not support the following device specific operators banddevice framedevice and renderbands device setup and output operators These operators are device specific e In PostScript Level 2 the LZWEncode CCITTFaxEncode and DCTEncode filter names are not supported with th
21. outside of macros This section provides specific information related to the DocuPrint NPS implementation of PCL 5c on the 4850 4890 92C For more information on PCL 5c see the HP PCL 5 Color Technical Reference Manual The DocuPrint NPS implementation of PCL 5c is tuned for optimal print quality on the 4850 4890 92C highlight color printers Note Ifthe same document is printed with PostScript and with PCL 5c the highlight color may not match exactly 7 When the DocuPrint NPS PCL 5c interpreter is installed on the highlight color printers the decomposer can switch between highlight color and monochrome modes dynamically on a per job basis You can specify monochrome printing that is Executive Black mode by setting the highlight color attribute to black The PCL 5e interpreter is used for monochrome mode In general PCL 5c jobs can be expected to have much larger file sizes than PCL 5e jobs because of the nature of the PCL 5c driver This is not a function of DocuPrint NPS The default highlight color rendering algorithm Automatic is not recommended for use with PCL 5c jobs Presentation and Pictorial rendering algorithms produce the best appearance The ColorToHighlight algorithm is also supported for PCL 5c For PCL 5c jobs the Thicken attribute has no effect 1 12 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES PCL5 User defined dither patterns are ignored The default highlight color
22. pattern 004 032 032 cvn def Signore D Z Z pattern 032 004 004 cvn def Signore Z D D pattern 004 032 004 cvn def Signore D Z D pattern 032 032 004 cvn def Signore Z Z D pattern 032 032 032 cvn def Signore Z Z Z pattern The following code redefines PS operators and names containing control characters Jobs containing the redefined commands will run without the undefined error Additional lines may be added here as needed O04initgraphics cvn initgraphics def remove D initgraphics 004 cvn initgraphics def Sremove D showpage 004 cvn showpage def Sremove D o Examples of case sensitivity sp 004 cvn sp def Sremove D Sp 004 cvn Sp def remove D SP 004 cvn SP def Sremove D The preceding definitions use the following rules e isolated illegal characters If the illegal characters occur alone or only with some combination of other illegal characters then the resulting token may be redefined as an empty PostScript procedure as shown in this example 004 cvn def Note Itis not desirable to redefine the token as null because this would leave a null object on the operand stack J XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 15 POSTSCRIPT e illegal characters adjacent to legal characters If there is no white space character as defined in the PostScript Language Reference Manual second edition between the illega
23. spots per inch Fast scan direction for the image is left to right across the page Slow scan direction for the image is top to bottom down the page This scan direction requires 90 degree internal rotation for HP AP oP oP oP AP Ol oe DocuPrint printers although the PostScript code has no explicit rotation given lines 3296 def lines in the image bpl 2528 def bits per line res 300 0 def spots per inch of image resolution useMask true def true gt use imagemask false gt use image save bpl res div 72 mul lines res div 72 mul scale bpl lines useMask false 1 ifelse bpl 0 0 lines neg 0 lines currentfile lt lt Uncompressed false K 1 EndOfLine false EncodedByteAlign false Columns bpl Rows lines EndOfBlock false BlackIs1 true gt gt ITTFaxDecode filter useMask imagemask image ifelse binary G4 data goes here end of G4 data restore showpage sEnd of Example The following example illustrates the requirements for embedding and printing an image in an enhanced scan If a large number of images are to be printed it is best to avoid the internal rotation To do this you must include the data in the order in which it is required which means that the fast scan direction for the image is bottom to top and the slow scan direction is left to right Assuming that the data was reordered in this way the following example shows a fragment of PostScrip
24. the System DocuPrint NPS is capable of processing any legal Type 0 Type 1 or Type 3 font Fonts of any of these types may be included ina document when it is sent to DocuPrint Type 0 Type 1 and Type 3 fonts may also be installed on the system using the font installation utility Note Only Type 0 OCF fonts are supported Type 0 CID fonts are not supported even when downloaded The DocuPrint PostScript interpreter does not use the additional metrics entry in a font dictionary PostScript font substitution error messages appear on the JOB MESSAGES AND ERRORS page only when the requested font is not present DocuPrint NPS uses Courier when a requested font is not available User defined fonts DocuPrint NPS accepts downloaded legal Type 0 1 or 3 fonts through the standard means used on other PostScript devices for downloading fonts Type 0 Type 1 or Type 3 fonts may be loaded permanently on the system by the system administrator using the font installation utility This method ensures that the desired fonts are available on the system and saves time later by avoiding the repeated transfer of fonts through the network Note Only Type 0 OCF fonts are supported Type 0 CID fonts are not supported J Caution Downloading fonts with a PostScript file is discouraged because printer performance may be degraded significantly Instead install the desired fonts on the controller then reference them from wi
25. to right fast scan top to bottom slow scan order By rotating the original 90 degrees clockwise you can obtain data from the scanner with the fast scan direction bottom to top relative to the original and the slow scan direction left to right matching the page scan directions for the correct output orientation Alternatively you can have the data reordered by a program before the PostScript master is created After determining that a certain scan orientation produces data in the optimum order for printing you can scan an image and import it into an emitter Some rotation may be necessary to place the image correctly If the emitter performs a rotation by manipulating the data then the resulting PostScript master may have the data in the incorrect order It is also possible that the emitter may not alter the data and change the transformations specified in PostScript so that the initial ordering is preserved Summary To minimize imaging time make sure that no data transformations need to be performed at the printer Order the image data so that the fast and slow scan directions match the output fast and slow scan directions when the image is in the correct orientation on the page With the image data correctly ordered arrange the PostScript transformations so that they specify the position and orientation of XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 31 POSTSCRIPT Scan resolution and scali
26. will not offset the current page In this case the next page will be offset There are other conditions that result in different sets of paper being offset in the output tray The DocuPrint NPS currently provides consistent support of the PCL Job Separation command when it appears at the beginning of the print job section that should be offset There are several recommendations to consider for the use of the PCL Job Separation command in DocuPrint NPS printing environments XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES PCL5 e Use DocuPrint NPS facilities for offsetting at the print job level Do not rely on the use of the Job Separation command at the end of every PCL job Although this is the HP recommendation a consistent offsetting of print jobs cannot be guaranteed For example actions such as resetting the HP LaserJet IIISi at the printer change the output tray offset The printer does not keep track of the offset tray position under all conditions e The Job Separation command can be used within a print job to offset sections of the print job This feature is sometimes referred to as creating report offsets within a print job The recommended job structure is to insert PCL commands before the section that should be offset The sequence of PCL commands is a Printer Reset command other PCL setup commands and the Job Separation command This PCL setup produces consistent results on the HP LaserJet IIISi a
27. 1 5 color values rendering 2 22 commands control D 2 14 2 18 control Z 2 14 2 18 Duplex PCL 1 7 LCDS 3 1 PCL Copy 1 6 1 7 PCL Offset Registration 1 11 1 12 PCL Paper Source 1 9 PJL 1 5 sets installing 3 3 communications asynchronous 2 14 components curveto 2 26 Index compression quality 2 27 consistency font 2 13 control D command 2 14 2 18 control Z command 2 14 2 18 conversion arc to bezier 2 26 LCDS commands 3 1 coordinates device 2 1 2 25 2 26 user 2 1 2 31 2 32 copypage 2 13 current transformation matrix CTM 2 1 curves 2 20 2 26 curveto components 2 26 D danger labels iii data flushing 2 16 placement operators 3 2 data base mode 3 1 See also line mode default font 2 3 user coordinate system 2 31 2 32 definitions nonstandard 2 9 2 10 delimiters EOF 2 14 2 16 delimiting PostScript jobs 2 14 demo mode VIPP 3 2 devices coordinates 2 1 2 25 2 26 dependent features 2 23 2 26 dictionary operators Execution 2 9 IdleTime 2 8 Printer 2 9 Server 2 7 2 8 Status 2 8 System 2 6 2 7 User 2 7 double byte fonts 2 2 drivers PCL 5c 1 14 drivers PCL 5c custom 1 14 dry ink distribution 2 12 Duplex commands PCL 1 7 duplex printing 1 6 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES INDEX 1 INDEX E EBCDIC 3 1 eexec operator 2 6 embedding images 2 27 2 33 engine w
28. 1 copy Sheet 17 PAGE 9 no copy command Sheet 17 PAGE 9 no copy command In addition if the stapling attribute is set for the document on a DocuPrint equipped with a High Capacity Stitcher Stacker pages 2 3 4 and 5 will be stapled together on all copies but pages 6 and 7 will not be stapled together because the copy command is given explicitly on each of pages 6 and 7 When the PCL Copy command is used on the DocuPrint all of the pages cannot be stapled together automatically If the document is printed as duplex refer to the PCL Duplex command section the behavior differences between the HP LaserJet 4si and the DocuPrint are greater The simplex issue in which DocuPrint copies are collated and HP LaserJet 4si copies are uncollated also applies to duplex printing Additionally the DocuPrint will blank the back side of the sheet and pull a new sheet if the copy command occurs on what is normally the back side of a sheet However the HP LaserJet 4si does not pull a new sheet of paper when the copy command appears on the back side of a sheet Instead the HP LaserJet 4si will place multiple copies of both the front and back sides of that sheet into the output even though multiple copies are not requested for the front side The following is an example of the same job as shown above printed as duplex Table 1 4 Duplex PCL Copy command example DocuPrint NPS collated output dup
29. 3 2 21 write white 2 12 2 13 resolution recommended 1 2 speed 2 27 Printer Control Language see PCL Printer Controller operations 2 18 Printer Dictionary operators 2 9 Printer Job Language see PJL printing duplex 1 6 R raster graphics 1 2 rendering color 2 22 gray 2 22 image 2 29 resolution 2 20 enhancement 2 10 2 13 fax 2 27 PCL 5 1 2 restore context bypassing 2 7 rotate operator 2 29 2 32 rotation image 2 28 2 29 RS232 port 2 14 S safety hotline iv precautions iii standards iii save context bypassing 2 7 scale operator 2 32 scaling 2 21 2 27 2 32 2 33 scanning conversion 2 18 2 20 order 2 27 2 32 rotation 2 27 2 32 serial port asynchronous 2 14 Server Dictionary operators 2 7 2 8 SetCacheDevice operator 2 25 setfileposition operator 2 17 setflat operator 2 20 setgray operator 2 22 setlinewidth operator 2 18 2 20 setscreen operator 2 25 2 26 simplex output 1 5 slow scan direction 2 28 2 30 specifications CCITT 2 27 PPD 2 23 speed printing 2 27 stapling 1 6 1 7 Status Dictionary operators 2 8 stdout message 2 18 storage object size limits 2 26 stroke operator 2 18 2 19 System Dictionary operators 2 6 2 7 T test masters handwritten 2 1 tokens defining 2 15 2 16 transforming user coordinates 2 32 tray assignment PCL 1 9 tray assignments 1 10 Tray definition PCL 1 9 Type 0 fonts 2 2 installing 2 2
30. 4small checkpassword b5 defaulttimeouts legal jobtimeout letter legaltray lettersmall lettertray note margins manualfeedtimeout pagecount printername product revision sccbatch sccinteractive setdefaulttimeouts setjobtimeout setmargins setpassword setprintername setsccbatch setsccinteractive waittimeout To control the consistency of output between more than one printer you must consider the following e printer resolution and resolution enhancement e printer imaging characteristics e font consistency e proprietary Postscript extensions The following sections provide guidelines for ensuring consistency between printers Printer resolution and resolution enhancement The most obvious reason for inconsistent output between two printing devices is that they have different resolutions For example a 600 by 600 dpi printer has much smoother looking fonts and curves than a 300 by 300 dpi device For the same physical size constant frequency of halftone you get four times the number of gray levels on a 600 by 600 dpi printer as on a 300 by 300 dpi device If your document contains scalable fonts or simple line art generated at 600 dpi the differences between printing it at 300 and 600 dpi are subtle However if your document contains bitmaps with a resolution of 600 dpi printing it at 300 dpi causes a degradation in image quality Figure 2 1 provides an example of a 300 dpi image and a 600 dpi 2 10 XERO
31. 8 lt ESC gt amp I1X 1 copy PAGE 8 lt ESC gt amp I1X 1 copy PAGE 9 no copy command Sheet 9 PAGE 9 no copy command As with simplex if the stapling attribute is set for the document on a DocuPrint equipped with a High Capacity Stitcher Stacker pages 2 3 4 and 5 are stapled together on all copies but pages 6 and 7 are not stapled together because the copy command is given explicitly on each of pages 6 and 7 PCL Duplex commands The following table summarizes the behavior of a selection of PCL Duplex commands lt ESC gt amp l S and lt ESC gt amp a G with respect to blanking the back sides of sheets Note Note WI These commands force new sheets to be pulled regardless of the value of the PlexChangesDynamic attribute lt __ For releases prior to 7 x the NPS plex attribute must be set to Duplex in order to use the PCL Duplex commands If the NPS plex attribute is set to tumbleDuplex then the job is printed as tumble duplex regardless of the PCL Duplex command Table 1 5 PCL Duplex commands DocuPrint NPS collated HP LaserJet 4si Next side command lt ESC gt amp a0G no new sheet no new sheet Front side command lt ESC gt amp a1G forces new sheet forces new sheet Back side command lt ESC gt amp a2G no new sheet no new sheet Simplex command lt ESC gt amp l0S forces new sheet forces new sheet Duplex command lt ESC gt amp l1S
32. C Avant Garde Gothic Book BookOblique Demi DemiOblique ITC Bookman Demi Demiltalic Light Lightltalic ITC Garamond Light Lightltalic Bold Boldltalic ITC Korinna Korinna KursivRegular Bold KursivBold ITC Zapf Chancery Mediumitalic ITC Zapf Dingbats Medium New Century Schoolbook Roman Bold Italic Bolditalic Palatino Roman Bold Italic Boldltalic Symbol Medium Times Roman Bold Italic Boldltalic A set of Type 0 OCF Chinese fonts is also available from Xerox These fonts are composite double byte fonts Note Type 0 fonts that you load on the printer controller must be a either fonts purchased from Xerox or fonts that meet specifications provided by Xerox Each composite font is stored in its own subdirectory Loading of Type 0 CID fonts is not supported Type 3 fonts can be installed from a DOS formatted floppy using the Install Fonts From Floppy command Type 3 fonts will install only if e The fonts are in the floppy s root directory e Each font is in a separate file e Each font file has a ps extension e Each font file contains a FontName definition with a unique name For MICR systems MICR PostScript E13B font is provided on diskette These fonts are in Type 3 format For more information 2 2 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Loading fonts see the Generic MICR Fundamentals Guide and the MICR printing chapter in the Guide to Configuring and Managing
33. DocuPrint monochrome printers only provision is made A for compatibility with pattern generation as long as the spot function returns values of O0 or 1 When a gray value is presented to the setgray operator DocuPrint NPS performs the following processes 1 Computes the index by multiplying the gray value by 255 0 and rounding the result index Round gray x 255 0 0 5 2 Sets the device gray value to the value in the transfer array at the which the index was calculated device color transferarray index Note Settransfer actually sets the transfer functions for all four color components red green blue and gray to the same value The setcolortransfer operator sets the transfer functions individually 7 2 22 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT PostScript printer description PPD files Implementation limits PostScript printer description files PPD files are readable text files that provide information about the special features of your printing device to the application program running on your host system PPD files include information about page sizes finishing features and fonts among other items PPD files are stored on aclient workstation or PC where they can be parsed by applications Some application programs supply PPD files for a variety of printers rather than have you contact printer manufacturers to obtain one The DocuPrint PPD files pr
34. LaserWriter but this is usually unnoticed because the control Z undefined command error occurs after the last page is printed In addition because the default error handling mode of the LaserWriter is to send the error back to the creator through the communications port most users never see the error This is not the case for PostScript products that have been configured to print a break page on every error Because the majority of the error messages caused by control Z are superfluous it is recommended that control Zs used as end of files be ignored 2 14 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Solution to control Z and control D problems L The recommended solution for the problems induced by control D and control Z is to include the following PostScript definitions They can be loaded permanently or prepended to jobs that have these problems These definitions catch illegal uses of these control characters and also allow the legal uses binary data to pass through untouched 004 cvn def Signore single D character 032 cvn def ignore single Z character 004 004 cvn def ignore D D pattern 004 032 cvn def Signore D Z pattern 032 004 cvn def Signore Z D pattern 032 032 cvn def Signore Z Z pattern 004 004 004 cvn def Signore D D D pattern 004 004 032 cvn def Signore D D Z pattern 004 032 004 cvn def Signore D Z D
35. SCRIPTION LANGUAGES POSTSCRIPT masters using cexec Usage of cexec is typically hidden by the encryption of eexec LaserWriter defines other entries in the System Dictionary that are specific to its device characteristics such as extra operators that deal with the hard disk Such operators are not part of the standard as defined in the PostScript Language Reference Manual second edition and are not implemented on DocuPrint NPS User Dict User dictionary entries that are implemented include cleardictstact countdictstack 2 sub end repeat startpage Prints a startup page start Init ps run DocuPrint implements print level commands provided by the client print command PostScript level print commands are ignored The following operators which are specific to the LaserWriter implementation of PostScript are defined with null functionality in DocuPrint NPS a4 legaltray a4small letter a4tray lettersmall b5 lettertray b5tray note legal The DocuPrint NPS User Dictionary contains the following definitions of values and procedures that mimic the LaserWriter II NTX but are not used by DocuPrint aa xu xs xv xt xw copies Note copies may be used to set the number of copies prior to T the first showpage of a job 7 Server Dict Server Dictionary operators that are implemented include dexch exitserver exchdef fontname With the exception of exitserver see the Printer Controller section of
36. Type 1 fonts creating 2 5 installing 2 3 loading 2 3 2 5 using 2 4 2 6 Type 3 fonts 2 2 installing 2 2 typefaces see fonts U undefined command error 2 14 user coordinate system default 2 31 2 32 mapping 2 1 User Dictionary operators 2 7 user defined fonts 2 3 V vector graphics 1 2 VIPP benefits 3 1 demo mode 3 2 documentation xii license 3 2 modes 3 1 3 2 virtual memory 2 16 2 25 w write black engine 2 12 2 13 2 21 write white engine 2 12 2 13 INDEX 4 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES INDEX X x axis 2 28 Xerox Generic Format see VIPP XGF see VIPP XGFNub See line mode extension Y y axis 2 28 Z zero width lines imaging 2 20 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES INDEX 5 INDEX INDEX 6 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES
37. X DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT image output on a 300 dpi printer The 600 dpi image appears larger and in a different position on the page Figure 2 1 300 and 600 dpi image output 300 dpi image 600 dpiimage printed on a 300 dpi printer printed on a 300 dpi printer In Figure 2 2 the 600 dpi halftone is distorted and only a portion of the image appears Figure 2 2 300 dpi image output Figure 2 3 600 dpi image output XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 11 POSTSCRIPT Printer imaging characteristics To preserve image quality when printing on 300 dpi printers regenerate the bitmaps at 300 dpi The 600 dpi printers can accept jobs with resources in either 300 or 600 dpi See Maintaining image quality in the PCL5e chapter for information about the recommended attribute settings to use when generating a document on your system Some manufacturers have added hardware imaging enhancements to 300 by 300 dpi printers that effectively boost the apparent dpi by micro controlling the laser beam The function is called post enhancement because it is performed by the hardware after the PostScript interpreter has imaged into the frame buffer The frame buffer is still only 300 by 300 dpi but the hardware is controlling the laser beam to produce smoother edges Other manufacturers have added pre enhancements that involve t
38. Xerox DocuPrint Network Printer Series Guide to Using Page Description Languages THE DOCUMENT COMPANY XEROX Version 7 1 August 2000 721P87491 Xerox Corporation 701 S Aviation Boulevard El Segundo CA 90245 1997 1998 1999 2000 by Xerox Corporation All rights reserved Copyright protection claimed includes all forms and matters of copyrightable material and information now allowed by statutory or judicial law or hereinafter granted including without limitation material generated from the software programs which are displayed on the screen such as icons screen displays looks etc Printed in the United States of America Publication number 721P87491 Xerox and all Xerox products mentioned in this publication are trademarks of Xerox Corporation Products and trademarks of other companies are also acknowledged Changes are periodically made to this document Changes technical inaccuracies and typographic errors will be corrected in subsequent editions Laser safety Warning Adjustments use of controls or performance of A N procedures other than those specified herein may result in hazardous light exposure The Xerox DocuPrint printers are certified to comply with the performance standards of the U S Department of Health Education and Welfare for Class 1 laser products Class 1 laser products do not emit hazardous radiation The DocuPrint printers do not emit hazardous radiation because the laser
39. ack to do the next line Remember that a laser printer scans a page ina raster method just like a television set Fast scan directions are not the same for a LaserWriter and the Xerox engine In general when turning on the same pixels the write white engine produces output that appears lighter than output produced by a write black engine Xerox device parameterized PostScript interpreters are able to partially compensate for this by rendering thicker strokes and fonts Device dependent PostScript cannot be compensated for because it is sending user created bit images instead of mathematical descriptions of the desired output e User defined PostScript fonts Some user defined fonts use bitmaps that are tuned to write black engines These fonts appear light on certain write white printers XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Font consistency image data at output device resolution PostScript image data that has a resolution matching the output device is typically transferred directly to the frame buffer with no modification These images appear light on certain write white printers e Black lines on a color background print white PostScript or PCL jobs that have black lines on a color background will print the lines with white borders This is a characteristic of write white printing e Single pixel fills Single isolated dots are visible on a LaserWriter but not on so
40. as closefile are rarely used with the standard devices Likewise miscellaneous file operators such as 2 24 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT status and bytesavail return different results when output is compared among different implementations of PostScript due to differences in the implementation of file I O Path limits The LaserWriter has a limit of 1500 path segments that can be defined in the current path Any master that exceeds this limit generates a limitcheck error DocuPrint NPS uses a different scheme for representing paths in its internal memory than that used by the LaserWriter Although the maximum number of path segments is larger than the LaserWriter s in other words masters that print on the LaserWriter also print on DocuPrint NPS without limitcheck error it is difficult to state the exact limit due to the different algorithm for storing rendered shapes in DocuPrint NPS PostScript VM limits DocuPrint simulates PostScript virtual memory VM limits default 4 MBytes When the PostScript VM limit is reached it sends the PostScript error message Me Error to the JOB AND ERROR MESSAGES page In rare cases when real VM runs out the Printer Controller sequencer is automatically restarted and the job is held for either restart or cancellation by the operator SetCacheDevice DocuPrint does not pad the bounding box of user defined fonts Emi
41. ation refer to the Related information section in this guide Before using this guide become familiar with its contents and conventions Contents This section lists the contents of this guide e Chapter 1 PCL 5 provides information about how to use PCL 5 with your DocuPrint printer e Chapter 2 PostScript contains the information you need to use PostScript with your DocuPrint printer e Chapter 3 VIPP provides instructions for using Variable Data Intelligent PostScript PrintWare formerly XGF with your DocuPrint Conventions This document uses the following conventions e All caps and angle brackets Within procedures the names of keys are shown in all caps within angle brackets for example press lt RETURN gt e Angle brackets Variable information or the position of a specified argument in the command syntax appears in angle brackets for example List Fonts lt Pattern gt XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES ix INTRODUCTION gt Bold Within procedures text and numbers that you enter are shown in bold for example enter privilege operator e Enter Within procedures the two step process of keying in data and pressing lt RETURN gt lt ENTER gt for example enter y e Italics Document and library names are shown in italics for example the Xerox DocuPrint Publishing Series Guide to Performing Ro
42. attribute determines the medium that the page uses regardless of whether there is a Paper Source tray selection or Page Size specification If a given page does not have a media exception but has both the Page Size and Paper Source specified then the medium specified by the Paper Source command is checked against the media list If the medium is of the appropriate size it is used If it is not of the appropriate size then the Paper Source command specification is ignored 1 10 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES PCL5 PCL Output Bin command If a given page has only a Page Size specification it is used to identify the required medium in the media list If no exact match is available the medium closest in size is used If there is more than one medium of the chosen size differing in color or weight the one appearing first in the media list is used If a given page contains only a Paper Source specification this determines the medium for the page The medium used is the nth medium in the media list where nis the tray that has been specified in the Paper Source command If the number of the tray specified in the Paper Source command is greater than the number of media in the media list then the paper source command is ignored If none of three methods of specifying media is available for a given page then the medium specified for the previous page is used with two exceptions an ExceptionPag
43. by any ordering of image data such as when the image sides are not parallel to the sides of the paper or when the image is skewed but for many cases a rotation can be avoided by ensuring that the data in the image is in the correct order Ensuring optimum image data order is complicated by the fact that the rotations are not tied to the use of the rotate operator ina PostScript program or to implied rotations in the image to user space transformation The transformations specified in PostScript are part of a specification of the desired position of an image in terms of the default user coordinate system DocuPrint NPS only performs an image rotation when one is required Rotations of multiples of 90 degrees are optimized so that the impact is not too great Because the data is already aligned with the printing orientation DocuPrint NPS does not perform any rotation of the image In the default user coordinate system a rotate operation is required Without the rotate operation the PostScript specifies that the image be placed on the page with its left edge fast scan dimension parallel to the short edge of the paper A 90 degree counterclockwise rotation of the coordinate system is needed to correctly specify the image orientation on the page It may be possible to arrange an appropriate order for the data by correctly arranging the original when a scan is performed It is assumed that scanners produce data from a portrait scan in left
44. caling 2 32 2 33 scanning 2 27 2 32 implementation limits 2 23 2 24 installing command sets 3 3 Type 0 fonts 2 2 Type 1 fonts 2 3 Type 3 fonts 2 2 Intellifont fonts 1 3 ISOLatin1 Encoding operator 2 6 J job description ticket JDT 3 2 L labels danger iii laser safety iii LaserWriter 2 18 LCDS commands converting 3 1 Level 2 operators 2 17 license VIPP 3 2 INDEX 2 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES INDEX limit path 2 25 storage object size 2 26 virtual memory 2 25 limitcheck error 2 25 line mode 3 1 3 2 line mode extension 3 3 lines zero width 2 20 loading fonts 2 3 2 5 logos 2 4 M mapping user coordinates 2 1 master PostScript 2 21 math operators 2 1 media selection precedence PCL 1 10 memory virtual 2 16 messages font substitution error 2 18 stdout 2 18 MICR font floppy 1 3 2 2 mixed plex simulated PostScript 2 17 multiple master font 2 4 N native mode 3 1 3 2 nonstandard definitions 2 9 2 10 0 operation safety iii operators copies 2 7 charpath 2 17 data placement 3 2 dictionary Execution 2 9 IdleTime 2 8 Printer 2 9 Server 2 7 2 8 Status 2 8 System 2 6 2 7 User 2 7 eexec 2 6 exitserver 2 16 2 18 file 2 24 2 25 fill 2 19 2 21 filter 2 17 2 27 floating point 2 1 ISOLatin1 Encoding 2 6 obsolete 2 26 pathforall 2 26 PostScript Level 2 2
45. cations channel AppleTalk protocol encapsulates PostScript jobs as files The LaserWriter AppleTalk software delimits PostScript jobs based on the AppleTalk file protocol AppleTalk encapsulates files in its own high level protocol This allows AppleTalk to support transparent data transmission that is there are no byte codes reserved for AppleTalk communication functions This means that all byte values are valid in a PostScript master This is not true when you are connecting an IBM PC to a LaserWriter over the LaserWriter asynchronous serial communications RS232 or RS422 There is no high level protocol such as AppleTalk has that delimits files so the control D character code octal 004 was chosen to delimit input files The LaserWriter asynchronous software handler strips out the control Ds and sends an EOF to the PostScript job server This prevents sending binary PostScript jobs jobs where all byte codes are valid PostScript data through the asynchronous serial communications port In contrast the LaserWriter can accept binary PostScript jobs over AppleTalk since it is data transparent Control Z and superfluous errors Control Z is not used by the LaserWriter RS232 asynchronous serial communications software yet it often appears at the end of many PostScript masters and can pose problems Control Zs appear at the end of many PostScript files created under the Microsoft Disk Operating System MS DOS They cause errors on a
46. color print model is not fully compatible with the complete set of 256 logical operations Use of logical operators which either negate NOT or exclusive or XOR the Destination or Texture such as 90 will result in incorrect color output HPGL Merge Control This is the HPGL equivalent of the Logical Operation command XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 1 13 PCL 5 Driver recommendations for PCL 5c This section identifies drivers that are recommended for the Windows 95 and the Windows NT 4 0 environments For Windows 95 the HP Color LaserJet 5 5M PCL 5C driver version vF2 2 is recommended For the driver s Color Setup option select Manual mode with the No Adjustment option to allow using device RGB Color Space in the document An alternative driver for this environment is the Xerox DocuPrint C55 driver For Windows NT 4 0 the HP Color LaserJet 5 5M PCL 5C driver is recommended For the driver s color Color Setup option select Manual mode with the No Adjustment option to allow using device RGB Color Space in the document For Graphic Mode select HP GL 2 mode for all the graphics in the document Limitations for custom PCL 5c drivers If you write your own PCL 5c drivers the following are recommended restrictions e Do not use Logical Operations that negate NOT either the Texture or Destination e Do not use Logical Operations that involve using XOR for Destination or Text
47. cript 1988 Addison Wesley VIPP publication The following is a list of HP PCL 5 publications Hewlett Packard Printer Job Language Technical Reference Manual September 1994 Hewlett Packard PCL 5 Printer Language Technical Reference Manual October 1992 Hewlett Packard PCL 5 Comparison Guide October 1997 Hewlett Packard PCL 5 Color Technical Reference Manual May 1996 Xerox Variable Data Intelligent PostScript PrintWare VIPP Reference Manual xii XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES L Maintaining image quality l PCL 5 The DocuPrint NPS system supports the following functions for source documents e On monochrome systems printing of PCL 5e masters containing PCL commands HP GL 2 commands fonts and data to be printed e On highlight color models printing of PCL 5e monochrome or PCL 5c color masters containing PCL commands HP GL 2 commands fonts and data to be printed Jobs can be submitted using the HP LaserJet 4 or LaserJet 4Si print drivers for monochrome printing with PCL 5e or the HP Color LaserJet for highlight color printing with PCL 5c DocuPrint NPS supports most HP PCL commands features and fonts including those for PCL the printer control language and HP GL 2 the vector graphics language The implementation of PCL 5e on DocuPrint NPS emulates the HP LaserJet 4 The implementation of PCL 5c on DocuPrint NPS emulates the HP Color LaserJet This
48. dither pattern is used instead PCL 5c coding recommendations When creating PCL 5c jobs there are some color related commands you should be aware of for optimal performance and print quality Use the Simple Color command whenever possible when greater color palette control is required use Configure Image Data short form with either Device RGB or Device CMY color space For defining gray shade fills Use RGB color values which provide a wider range of gray shades Alternatively use the Built in shade fills Fill Rectangle Area with shade fill command or HPGL FT10 this is less than optimal When using Configure Image Data short form use the Direct by Plane pixel encoding mode for optimal performance The Direct by Pixel and Indexed by Pixel are the second and third recommended choices respectively Avoid using the following commands Logical Operation and HPGL MC Fill Rectangle Area with user defined pattern fill and HPGL FT11 PCL 5c functions not applicable to DocuPrint NPS The following PCL 5c functions are not applicable to NPS printers and therefore it is recommended that they not be included in PCL 5c jobs Halftone Render Algorithms Download Dither Matrix Gamma Correction Color Lookup Tables Viewing Illuminant Driver Configuration The following PCL 5c functions are not fully functional on the NPS printers and their usage is discouraged Logical Operation The highlight
49. e PCL interpreter to the DocuPrint sequencer are images as they would appear on an HP LaserJet 4 In addition to the page images certain switches are passed to the sequencer to indicate desired output behaviors The switches can control the plex requested page side media index number of copies and output bin These switches make it possible for the sequencer to emulate most of the behaviors of duplexing PCL XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 1 11 PCL 5 PCL 5 coding recommendations printers even though the PCL interpreter is emulating a simplex PCL printer There are no switches that control how the image is shifted because the DocuPrint sequencer does not perform image shifting on a page by page basis but only on a job by job basis PCL 5c support When creating PCL 5 jobs there are some general recommendations for optimal performance e Use PCL Fill Rectangle Area for horizontal and vertical lines and rectangles e Use HPGL for other synthetic graphics curves diagonal lines e Minimize raster usage avoid translating fonts or lines into raster data on fast 100Mbit networks send uncompressed data e Maximize use of internal scalable fonts e Define logos as fonts rather than raster graphics e Rotate rasters to align with printer edge feed using the Raster Graphics Presentation Mode if possible e Minimize switching between HPGL and PCL modes e Download resources
50. e filter operator Note The DCTDecode filter does not work correctly for all full color images J e Unlike the Adobe implementation of PS Level 2 the setfileposition operator is permitted on stdin when the standard input comes from a file e The charpath operator is not supported with the PostScript Level 1 interpreter when used on type 3 fonts However this operator is supported with PostScript Level 2 Due to support of mixed paper sizes PostScript files that use the clippath pathbbox operators to determine the imageable area of the page will not image shift correctly Image shifting will not occur by using the AdjustX and AdjustY system options nor the image shift document attributes HorizontallmageShift HorizontallmageShiftforBack VerticallmageShift VerticallmageShiftforBack and the ExceptionPage image shift For releases prior to 7 x simulated mixed plex is supported using the standard PostScript Level 2 Duplex pagedevice key The Duplex key is supported only with the PostScript Level 2 interpreter when the plex attribute value is duplex The Tumble key is not supported The Duplex key is not supported when used in a job with the MultiSet specific pagedevice keys EndOfSet EndOfRun and Staple which are also capable of simulating mixed plex For more information on mixed plex jobs see the chapter Mixed plex applications in the Guide to Managing Print Jobs XEROX DOCUPRINT NPS GUIDE TO USING
51. eet 3 PAGE 2 lt ESC gt amp l3X 3 copies Sheet 4 PAGE 4 no copy command Sheet 4 PAGE 2 lt ESC gt amp l3X 3 copies Sheet 5 PAGE 5 no copy command Sheet 5 PAGE 3 no copy command Sheet 6 PAGE 2 lt ESC gt amp l3X 3 copies Sheet 6 PAGE 3 no copy command Sheet 7 PAGE 3 no copy command Sheet 7 PAGE 3 no copy command Sheet 8 PAGE 4 no copy command Sheet 8 PAGE 4 no copy command Sheet 9 PAGE 5 no copy command Sheet 9 PAGE 4 no copy command Sheet 10 PAGE 2 lt ESC gt amp l3X 3 copies Sheet 10 PAGE 4 no copy command Sheet 11 PAGE 3 no copy command Sheet 11 PAGE 5 no copy command Sheet 12 PAGE 4 no copy command Sheet 12 PAGE 5 no copy command XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 1 5 PCL 5 Table 1 3 PCL Copy command example continued DocuPrint NPS collated output simplex HP LaserJet output simplex Sheet 13 PAGE 5 no copy command Sheet 13 PAGE 5 no copy command Sheet 14 PAGE 6 lt ESC gt amp l2X 2 copies Sheet 14 PAGE 6 lt ESC gt amp l2X 2 copies Sheet 15 PAGE 6 lt ESC gt amp l2X 2 copies Sheet 15 PAGE 6 lt ESC gt amp l2X 2 copies Sheet 14 PAGE 7 lt ESC gt amp l2X 2 copies Sheet 14 PAGE 7 lt ESC gt amp l2X 2 copies Sheet 15 PAGE 7 lt ESC gt amp l2X 2 copies Sheet 15 PAGE 7 lt ESC gt amp l2X 2 copies Sheet 16 PAGE 8 lt ESC gt amp l1X 1 copy Sheet 16 PAGE 8 lt ESC gt amp l1X
52. efault Printer default Printer default Print quality Keep the following points in mind when preparing your images and setting print attributes e Page protection orientation and memory are not values that affect the image quality e Setting the graphics quality to HIGH allows for the best possible output e Setting print quality to printer default allows the printer to determine the best match for the job e The DocuPrint 92C NPS can produce a single pixel line However because of the many variables involved such as print 1 2 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES PCL5 density settings and line placement on the page Xerox cannot guarantee the quality of these single pixel lines Specific questions regarding single pixel line printing for your application should be directed to your Xerox service engineer PCL 5 media support Acceptable sizes for DocuPrint Models 4050 4090 4850 4890 or 92C are USLetter USLegal A4 and nxn Acceptable sizes for DocuPrint Model 96 4635 and 180 are USLetter USLegal USLedger Tabloid A3 A4 and B4 Note For PCL jobs custom paper sizes and mixed paper sizes within a PCL job are supported as of release 7 x 7 For more information on how PCL media commands are interpreted on DocuPrint NPS refer to the section PCL media selection in this chapter PCL 5 font support
53. er to the Adobe PostScript Language Reference Manual for the proper syntax specifically the sections on the image and imagemask operators the FaxDecode filter and transformation matrixes The source parameter of the CCITTFaxDecode filter operator should be set to currentfile and the bit sample parameter of the image operator should be 1 for a binary image because this method of submission uses an embedded CCITT compressed image Either form of the image and imagemask operators can be used however DocuPrint does not support any functionality in the dictionary form that exceeds the functionality available through the non dictionary form of the operators Print performance related to image printing Scan order and rotation Printing speed for CCITT G3 G4 documents is determined largely by the decompression and imaging time The decompression time is correlated with the compression ratio better compression means less time The imaging time is correlated with the kind of scaling and rotation performed Consequently printing speed is dependent on the document characteristics Optimal performance for CCITT G3 G4 printing is obtained with a 1 to 1 scaling for example 300 dpi input resolution and 0 degree rotation DocuPrint software is optimized to provide good performance for the most frequently employed resolutions and rotations For example resolutions of 200 dpi fax 240 dpi IBM etc 400 dpi extended fine fax and rotatio
54. es specification is not used and if the page is a first page then the first medium in the media list is used For duplex jobs the medium for the front side of a given sheet is the medium used for the sheet regardless of the medium selected for the back side PCL Offset Registration commands 9 Caution Do not use the DocuPrint NPS Output Bin attribute when using the PCL Output Bin command otherwise the PCL command will be ignored PCL uses the Output Bin command lt Esc gt amp l G to select an output bin where is replaced by a number e When 1 then the Stacker Group will be 1 e When 2 then the Stacker Group will be 2 The PCL Left Offset Registration command lt Esc gt amp l U and Top Offset Registration command lt Esc gt amp l Z are not supported when the job is duplexed The symbol is used to indicate the size of the offset The Left and Top Offset Registration commands instruct the printer to shift the entire page image in a desired direction Unfortunately the PCL specification has made the direction of the requested shift dependent on which page side front or back and in which plex long edge binding or short edge binding the page is printed The PCL interpreter on DocuPrint NPS is designed to emulate the HP LaserJet 4 a simplex only printer Therefore it does not perform the correct registration offset when plex and page side PCL commands are used The page images passed from th
55. he PostScript interpreter In these printers the frame buffer is actually larger because the PostScript interpreter is effectively rendering at a higher resolution The hardware performs some of the halftoning function to provide finer halftoning resulting in picture output that looks smoother You can only accurately compare two different printers if both are using the same enhancement techniques or if all enhancement techniques are turned off Most xerographic printers do not image perfect circular dots with even dry ink distribution The dry ink spread is typically Gaussian with dry ink density being the greatest at the center of the dot and fading off toward the edges The terms write white and write black are broad generalizations The specific print imaging characteristics of some products may not represent other products with the same write white or write black classification For example the HewlettPackard HP LaserJet and the LaserWriter Il NTX use a write black laser printer engine that uses the laser beam to write where dry ink should go Therefore single pixel dry ink dots are approximately round and are visible on an HP LaserJet In contrast write white laser printer engines write the dry ink free areas which can create single dots that have four concave sides It is important to distinguish the fast scan direction which is the direction the laser beam moves across the page before jumping b
56. ic MICR Fundamentals Guide Note Fonts installed using the Install PCL Fonts from Floppy command cannot be selected by font ID They must be selected by characteristics Only fonts installed using this command can be deleted using the Delete Fonts command PCL fonts installed with the system software cannot be deleted Refer to the Xerox DocuPrint Network Printer Series Guide for Configuring and Managing the System for information on loading fonts from floppy and from CD ROM Table 1 2 PCL 5 fonts installed with NPS software Intellifont Typeface CG Times Medium Italic Bold Bold Italic Univers Medium Italic Bold Bold Italic Univers Condensed Medium Italic Bold Bold Italic Courier Medium Italic Bold Bold Italic Letter Gothic Medium Italic Bold Albertus Medium semi bold Extra Bold Antique Olive Medium Italic Bold Clarendon Condensed Bold Coronet Medium Italic Garamond Antiqua Medium Kursiv Italic Halbfett Bold Kursiv Halbfett Bold Italic Marigold Medium CG Omega Medium Italic Bold Bold Italic Arial Medium Italic Bold Bold Italic Times New Roman Medium Italic Bold Bold Italic Symbol Medium Wingdings Medium Line Printer 16 67 pitch 8 5 point medium XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES PCL5 PCL command support The following sections explain the differences in proces
57. ion example above 300 samples per inch of output size were provided and output scaling is not required Common cases of scaling are optimized to minimize the performance penalty See Performance measurement in the Troubleshooting Guide Recognition of optimized cases is dependent upon precise scale values For this reason you should always have the scale values calculated by the PostScript code as shown in the examples Optimized scaling works well with optimized rotations The following example illustrates the requirements for embedding and printing an image in a normal scan This example uses the default PostScript user coordinate system The image data is already in the correct order for that coordinate system so the use of the rotate operator is not required DocuPrint NPS performs an internal rotation of the image data in order to align it properly with the print scan ordering Three hundred samples per square inch of output size is provided and scaling is not required 2 32 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Figure 2 12 PostScript with embedded image normal scan order oe IPS Adobe 3 0 oe G4 example ps Example using embedded CCITT group 4 G4 data Example using data in normal scan order which has the fast scan direction left to right and the slow scan direction top to bottom Page size is roughly 8 5x11 slightly clipped Data has resolution of 300
58. ipt language extensions System Dict DocuPrint NPS emulates some but not all of the LaserWriter Il NTX containing version 47 of Adobe PostScript product specific functionality as noted in this section When unimplemented operators are encountered in the PostScript master the standard error message Undefined appears on the job messages page This section contains PostScript dictionary entries that are defined in the LaserWriter II NTX These PostScript definitions are not part of the PostScript language The following System Dictionary operators are implemented e print dup type stringtype ne string cvs e Run dup flush run e rror The common error handling routine used by all of the standard error handlers The following System Dictionary operators are implemented e ISOLatini Encoding This is a 256 entry font encoding array based on the International Standards Organization Latini encoding vector eexec This is a decryption operator typically used for decoding Type 1 fonts For a detailed description refer to the Adobe Type 1 Font Format version 1 1 e cexec The DocuPrint 1 5 and higher cexec implementation simply consumes and ignores the data fed to cexec The cexec operator is used to download machine code patches As such cexec is Motorola 6800 cpu dependent and is not completely implemented DocuPrint NPS does not handle PostScript 2 6 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DE
59. l character or characters and legal PostScript characters then that combination can be redefined to be the legal PostScript substring only as shown in these examples showpage 004 cvn showpage def sp 004 cvn sp def Note Itis not desirable to redefine a legal substring ABC as oi some other legal substring XYZ in the illegal token initialization file For instance although showpage frequently is redefined by PostScript code to be sp for brevity it may seem to make sense to redefine sp lt control D gt as showpage However if the client application creating the PostScript defines sp to mean show rather than showpage then to have sp lt control D gt initialized to mean showpage is an error Also due to case sensitivity some patterns may have to appear with the same case variety as in the PostScript jobs to be processed Because there may be an infinite number of character combinations the system administrator is encouraged to redefine only known or suspect problem tokens J Multiple jobs in one input file Note that the above control D handling does not perform true PostScript job encapsulation Therefore the following PostScript job situations may cause problems All of these problems are due to having multiple PostScript jobs in one input file If problems occur break the concatenated masters into separate input files e Because control Ds are not interpreted as end of job EOJ PostScript virtual memory VM is
60. lex HP LaserJet 4si output duplex Sheet 1 PAGE 1 duplex command Sheet 1 PAGE 1 duplex command Sheet 2 PAGE 2 lt ESC gt amp l3X 3 copies PAGE 2 lt ESC gt amp l3X 3 copies PAGE 3 no copy command Sheet 2 PAGE 1 duplex command Sheet 3 PAGE 4 no copy command PAGE 2 lt ESC gt amp l3X 3 copies PAGE 5 no copy command Sheet 3 PAGE 1 duplex command Sheet 4 PAGE 2 lt ESC gt amp I3X 3 copies PAGE 2 lt ESC gt amp I3X 3 copies PAGE 3 no copy command Sheet 4 PAGE 3 no copy command Sheet 5 PAGE 4 no copy command PAGE 4 no copy command PAGE 5 no copy command Sheet 5 PAGE 3 no copy command Sheet 6 PAGE 2 lt ESC gt amp l3X 3 copies PAGE 4 no copy command PAGE 3 no copy command Sheet 6 PAGE 3 no copy command 1 6 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES PCL5 Table 1 4 Duplex PCL Copy command example continued DocuPrint NPS collated output duplex HP LaserJet 4si output duplex Sheet 7 PAGE 4 no copy command PAGE 4 no copy command PAGE 5 no copy command Sheet 7 PAGE 5 no copy command Sheet8 PAGE 6 lt ESC gt 8 amp l2X 2 copies PAGE 6 lt ESC gt amp I2X 2 copies Sheet 9 PAGE 6 lt ESC gt amp l2X 2 copies Sheet 7 PAGE 5 no copy command Sheet 10 PAGE 7 lt ESC gt amp l2X 2 copies PAGE 6 lt ESC gt amp I2X 2 copies Sheet 11 PAGE 7 lt ESC gt amp l2X 2 copies Sheet 8 PAGE 7 lt ESC gt amp l2X 2 copies Sheet 12 PAGE
61. line FontType1 SpecVersion Font Name FontVersion SpecVersion is the version of the Adobe Type 1 Font format to which the font program conforms FontName is the name of the font understood by the PostScript interpreter FontVersion is the version number of the font program The first line of the Type 1 font which is available by reading the header of the Type 1 font program can aid in determining differences between fonts on PostScript devices Using Adobe Type 1 fonts One of the factors that can negatively impact performance on DocuPrint NPS is the use of small graphic images logos and signatures embedded in PostScript masters When these graphic items are used on each page of a document DocuPrint performance can be slowed down The Type 1 font capabilities of DocuPrint can handle commonly referenced small or large graphic elements such as logos and signatures You can install and remove any Adobe Type 1 font from a DocuPrint system using standard administrator commands in the DocuPrint Printer Controller Fonts used only occasionally for a single job can be included in the PostScript master for the jobs that require them Caution Type 1 fonts should not be downloaded with a PostScript file because printer performance will be degraded significantly Instead use the Install Fonts From Floppy or CDROM command and then reference the font in the PostScript file Q Using fonts for small graphic elements has the foll
62. llowing is an example of the extension used to execute the VIPP command job1 jdt STARTLM command set named job1 at the front of the main data file 1 Enter the following in the job 1 file usr xgfc mislib job1 ini custom ini job1 jdt STARTLM 2 Send the main data file to DocuPrint NPS to set the DocumentFormat attribute to XGF job1 Refer to your DocuPrint NPS documentation for other methods to set the DocumentFormat attribute such as by using a virtual printer or by the lpr C switch Note New sets of commands can be installed at any time by creating new files called usr xgfc mislib xxx ini where xxx is the name of the command set The extension ini is mandatory Use all lower case characters in place of xxx J XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 3 3 VIPP 3 4 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES Symbols copies operator 2 7 stdin 2 24 2 25 pfb extension 2 5 A additional metrics entry 2 3 Adobe Type Manager 2 5 AppleTalk 2 14 arc to bezier conversion 2 26 ASCII input 2 18 asynchronous communications 2 14 bezier 2 26 binary input 2 18 bitmaps 2 3 2 12 bounding box padding 2 25 break page 2 14 c CCITT printing speed 2 27 specifications 2 27 character codes 2 5 illegal 2 15 2 16 characteristics image 2 12 charpath operator 2 17 Chinese fonts 2 2 collating PCL Copy command
63. me write white printers therefore single pixel isolated fills in PostScript may not be visible on your product You may be able to correct the above situation by means of the Change Imager Parameters command Set the FatScanConversion option to Yes This should only be used if needed because it may degrade performance Note When the copypage operator and darkening are used together either via the Thicken attribute or a Change Imager Parameters command the data printed on every page generated by copypage becomes progressively darker In addition to these PostScript issues your output may not meet your expectations if your printer is not set within the Xerox print quality specification range Please make sure your printer has been adjusted by a qualified technician Proprietary PostScript extensions If you do not use exactly the same fonts on both printers you cannot expect the output to look the same The actual shape of the characters in any given font varies among different font manufacturers In fact different versions of a font from the same manufacturer may have different shapes and character sets Because some PostScript printers have fonts permanently installed it is likely that newer models may have newer versions of the same fonts The font rasterizer software may vary between printer models also resulting in output differences Some PostScript printers contain proprietary PostScript extensions In general
64. meDict entries contain defined values or routines to mimic the LaserWriter II NTX but are not used by DocuPrint bmpl boundsCheck exitWhenDone idleA ReadidleFonts stopPred ROMnames 2 8 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Printer Dictionary Printer Dictionary printerdict entries that are implemented include framelimit width height xoffset mtx yoffset The following printerdict print command operators are defined with null functionality DocuPrint implements print level commands as provided by the DocuPrint Client print commands PostScript level print commands are ignored 19 24 25 dopage proc setpage 00WN _0 Execution Dictionary Nonstandard definitions Execution Dictionary execdict entries that are implemented include checkquit print execdepth quitflag idleproc stmtfile Commercial PostScript creators commonly use nonstandard product specific definitions without encapsulating the definitions with an existence check This check searches for the existence of a nonstandard definition and bypasses the definition if it is undefined XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 9 POSTSCRIPT Examples of nonstandard definitions Appearance consistency The following two dictionaries and their operators are examples of nonstandard product specific definitions Statusdict Userdict a4tray a4 b5tray a
65. mmends that the Job Separation command be included at the end of each job There is no mention of possible side effects when this practice is not followed This PCL Job Separation command description is based on the printing behavior observed on the HP LaserJet IIISi Job Separation toggles the output tray offset It is primarily a printer hardware function There were no observed page processing effects The PCL Job Separation command has these major features e The Job Separation command operates independent of all other PCL commands This command is the only PCL command that changes the output tray offset e The Job Separation command toggles the output tray offset The output tray offset is switched between two positions This command does not set the output tray offset to a specific position e The Job Separation command sends a hardware command to toggle the output tray offset that is executed immediately e The Job Separation command takes effect on the current page that is being processed It will be observed when this page is ejected e The output tray offset is retained between print jobs This offset consistency cannot be guaranteed since there are ways to change the output tray offset between print jobs When a PCL Job Separation command is encountered on a page DocuPrint NPS will offset that page from the previous page If the job is printed duplex and the command is encountered on the backside of the page DocuPrint NPS
66. nd the Xerox DocuPrint NPS e Do not place the Job Separation command at the end of a page that starts a section with a new output tray offset There are significantly different results when printing the same print job on the HP LaserJet IIISi and the Xerox DocuPrint NPS e Use a PCL copy count of 1 one Inconsistent offsetting takes place when multiple copies are specified Sheets in the printer output are not stacked with the desired offset PCL media selection There are three ways to specify media for a given page You can use the PCL Page Size command lt Esc gt amp l A the PCL Paper Source command or you can use the DocuPrint NPS ExceptionPages attribute PCL Paper Source command tray assignment PCL uses the Paper Source command lt Esc gt amp l H to specify the tray definition is a number from 0 6 O don t change paper source 1 feed paper from printer specific tray 2 feed paper from manual input 3 feed envelope from manual input 4 feed paper from lower tray 5 feed paper from optional paper source 6 feed paper from optional envelope Note These are the documented values of HP printers However at il the DocuPrint NPS changes paper by media definition and not by tray definition J XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 1 9 PCL 5 These numbers map directly to the media list set for the Media document attribute on the virtual printer or in the job submis
67. ng the image relative to the PostScript default image and user coordinate systems Just as rotation of an image is often required to produce correct output scaling is also often required To reduce imaging time present the data so that scaling is not required supply data for 300 dots per inch of output size in both dimensions Part of the image to user space transformation for any image is the scaling that takes image coordinates to physical coordinates in user space DocuPrint splits the transformation into two parts The scale operator is needed as part of the transformation from the unit square in user space 1 unit equals 1 point which equals 1 72 inches to the destination rectangle or parallelogram In the following example the number of samples in each dimension is divided by the input resolution giving the size of the image in inches which is multiplied by 72 to obtain the size in points The two computed values are used as scale factors to take the unit square to the size of the original image Figure 2 11 Scaling and resolution example lines 3296 def lines in the image bpl 2528 def bits per line res 300 0 def spots per inch of image resolution bpl res div 72 mul lines res div 72 mul scale As with rotation the image to user space transformation specifies the output size of the image and internal scaling may or may not be required depending on the data available In the scaling and resolut
68. ng to required CPI LPI e Font indexing e Automatic frame and zebra generation e Form merge e Page numbering e Cycle form printing of data multiple times with different forms e Cycle feed printing of data multiple times on different paper VIPP is not a converter that takes source or other PDLs and translates them to PostScript It is contained in the PostScript decomposer as a set of subroutines callable from within the PostScript language VIPP is independent of the printer and level of PostScript being used and supports the entire DocuPrint NPS family of products VIPP is supplied as a PostScript prologue that is loaded into the interpreter as part of startup Each copy of the dictionary is licensed to a particular printer and functions only on that printer DocuPrint NPS supplies a demonstration license that allows printing of VIPP documents up to 200 pages in length without a specific printer license A license is required for longer documents 3 2 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES VIPP VIPP line mode extension XGFNub The VIPP line mode extension formerly called XGFNub is a DocuPrint NPS Version 1 4 and higher extension that enables users to execute VIPP commands at the start of any VIPP document Multiple sets of commands may be enabled by the DocumentFormat attribute To invoke a command set named xxx just set the DocumentFormat attribute to XGF xxx The fo
69. ns regarding single pixel line printing for your application should be directed to your Xerox service engineer Some user defined fonts use either outlines or bitmaps that are tuned to write black printers As a result these fonts appear light on the Xerox DocuPrint printers Character rasterization for fonts that use PostScript painting operators is subject to the scan conversion rules described earlier in this chapter It is often difficult to determine if a PostScript master uses user defined fonts To do so requires studying the master in detail unless the creator has followed the standards suggested in the PostScript reference manual and specified the fonts used by the document ina PostScript comment format An example of this format is DocumentFonts lt fontname gt DocumentSuppliedFonts lt fontname gt However if the character shapes seem poorly rasterized user defined fonts probably are contained in the master When possible use Type 1 fonts which are rasterized through special techniques for best output quality Note that the DocuPrint PostScript interpreter applies thickening to certain graphics rendering operations For example outline fonts in the Type 1 format are subject to rasterization techniques that use thickening for best quality of text rendering on Xerox devices XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 21 POSTSCRIPT Rendering of color and gray values
70. ns of 0 90 180 or 270 degrees Arbitrary scaling and or rotation may impact performance Typical CCITT G3 G4 images have the fast scan direction along the short edge of the paper and DocuPrint images along the long edge of the paper Therefore in most cases it is necessary to perform an image rotation of 90 degrees on the CCITT G3 G4 data It is beneficial to create and to store CCITT G3 G4 images with optimal scaling and rotation values for the target printer These CCITT G3 G4 images of reasonable compression ratios typically print at or near rated printer speed A scanned or sampled image is defined as a rectangular array of sample values each representing some color In a PostScript program such an image is represented by a sequence of sample values obtained by scanning the image rectangle in row or column order XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 27 POSTSCRIPT Purpose For any image there are eight such sequences four scan origin possibilities with either a row or a column order choice for each Any of these sequences may be used in a PostScript program as long as the image to user coordinate transformation matrix is prepared correctly There is one sequence in each case that enables the fastest processing on DocuPrint NPS You should know why there is a difference in speed depending on the order chosen and how to choose the optimum order The laser scans the image area in
71. nsidered minimum values Obsolete operators banddevice framedevice renderbands The banddevice framedevice and renderbands operators are obsolete and should not be used These operators were not meant to be included in page descriptions and were used only in certain implementations for device setup Arc to Bezier conversion pathforall The pathforall operator returns the components of the current path Path components arc arcn and arcto are converted to sequences of curveto components The standard does not define the arc to Bezier curveto conversion algorithm Therefore different PostScript implementations may return different pathforall results Note All PostScript implementations should return the same equivalent path but the path may be composed of a different number of curveto components PostScript masters that depend on a particular arc to Bezier conversion algorithm may not be consistent across different PostScript printers 4 2 26 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Creating the necessary PostScript CCITT Group 3 and 4 You can embed an image that is compressed to CCITT group 4 specifications in the PostScript You need to add several standard PostScript statements before the embedded image to provide the image parameters and to properly use the FaxDecode filter Images use the PostScript image imagemask and filter CCITTFaxDecode filter operators Ref
72. ollowing rules e Scan Conversion paints only those pixels whose centers lie within the shape if The resolution of the source image sampled image is higher than the device resolution Scan Conversion paints those pixels whose centers lie within the shape 2 20 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT Image quality The resolution of the source image sample image is lower than the device space and the scaling of source image to device space is an integer multiple and rotation is in multiples of 90 degrees e Scan Conversion paints any pixel whose square region intersects the shape if the resolution of the source image is lower than that of device space and the scaling between source image and device space is not an integer multiple This effect is noticeable when you are printing a sampled image with a resolution of less than 600 dpi on the printer at 600 dpi DocuPrint NPS output is superior to that of other printers that use write black technology in the following areas e Black regions are darker e Fonts of small point sizes are more readable e Single pixel wide white lines on a black background are visible Note The DocuPrint 92C NPS can produce a single pixel line However because of the many variables involved such as print density settings and line placement on the page Xerox cannot guarantee the quality of these single pixel lines Specific questio
73. oordinates You can describe pages in your own coordinate system and let the PostScript software transform your requests into the device space PostScript masters are device independent only when they do not use the actual CTM values When a master needs CTM values it becomes device dependent The occasional need for CTM values causes inconsistent output across different PostScript printers Some handwritten test masters print out CTM values Since these values vary depending on the device resolution and positioning the test master output also varies making these tests useless for consistency testing across different PostScript printers XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 1 POSTSCRIPT Fonts DocuPrint NPS contains 51 PostScript Type 1 fonts listed in the following table These fonts are standard Type 1 fonts licensed through Adobe Systems Inc However because DocuPrint NPS may contain different versions of fonts than other PostScript devices there could be slight differences in shapes of characters and the character sets of certain fonts Table 2 1 Adobe Type PostScript fonts Font Typeface Courier Courier Bold Oblique BoldOblique Helvetica e Helvetica Bold Oblique BoldOblique Light LightOblique Black BlackOblique e Condensed Condensed Oblique Condensed Bold Condensed BoldOblique e Narrow Narrow Bold Narrow Oblique Narrow BoldOblique IT
74. ovided with DocuPrint software conform to version 4 2 of Adobe PPD specifications If your application software supports version 4 2 PPD files the DocuPrint PPD files should be used when generating print documents from your application If your application does not support version 4 2 of the PPD specification the Generic PPD file can be used In the cases where using the LaserWriter PPD file results in PostScript code that contains operations not supported on DocuPrint use the NULL PPD file that is available with some applications Features that are known to be device dependent see the Adobe PostScript Language Reference Manual 2nd edition for a list may differ from other implementations These include performance VM usage certain kinds of shading and line thickness some kinds of halftoning resolution dependencies and certain implementation limits The following table lists the implementation limits that are not defined in the PostScript standard but are inherently different on PostScript devices XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 23 POSTSCRIPT Table 2 2 Implementation limits Quantity Limit Description integer Largest 29 1 X Smallest 231 real Largest 1038 Actual values are slightly less than 10 88 Smaise and slightly more than 10 array 65536 or 2 8 Maximum length of an array dict 65536 or 2 8 Maximum capacity of a
75. owing advantages over using referenced content files e You do not need to perform the NFS setup required for referenced content files DocuPrint can be used in a standard configuration e Visual elements stored as fonts can be easily rotated and scaled 2 4 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES POSTSCRIPT e Font characters are cached so that multiple uses of a visual element in a document are rendered quicker if the elements are taken from a font than if they are read from supplementary files e Including graphic images is easier when creating the document Producing Type 1 fonts for use with DocuPrint Third party software for font editing and creation is available for most popular personal computing systems With these programs you can edit or produce outlines from a bitmap obtained by scanning existing line art Each graphical item that is referenced must be assigned to a character code in a font You can incorporate many graphic elements in a single font by assigning each element to a different character code or you can place each item in its own font Once created you must save Type 1 fonts on an MS DOS diskette as files with the pfb extension You can then load the fonts from diskette onto a DocuPrint system using the administrator Install Fonts From Floppy command Using a Type 1 font in a document When you create a document using a standard document editor you enter the cha
76. pi ell printing only J To obtain the best image quality on the DocuPrint NPS choose the correct printer setup attributes when generating a document on your personal computer Refer to the Appearance Consistency section in the PostScript chapter for more information on resolution The following table shows the recommended printer settings in order of preference e The recommended choice is listed in the 300 dpi vector graphics settings column The print quality of an object that is created in HP GL 2 mode is very consistent Because the image is not a bitmap the data is not skewed e The second choice is listed in the 600 dpi vector graphics settings column Because you are using an image that is not a bitmap the data will not be skewed and the differences would be difficult to detect e The last choice is listed in the 300 dpi raster graphics settings column The print quality deteriorates if the image is a rasterized bitmap which leaves some white space where the bits are not formulated Table 1 1 PCL settings 300 dpi 600 dpi 300 dpi Setting vector graphics vector graphics raster graphics Resolution 300 600 300 Page protection OFF OFF OFF Orientation Portrait Portrait Portrait Memory 2 2 2 Option HP GL 2 HP GL 2 RASTER Graphics mode Option HIGH HIGH HIGH Graphics quality Option Photographic images _ Photographic images Photographic images Halftoning Option Printer d
77. racter that refers to the graphic image you want assign the appropriate font to it and size and place it to fit the document If you are using Adobe Type Manager the image is scaled and displayed The PostScript driver of the document editor selects the font using the PostScript operator findfont and scales the font using scalefont Once the font is installed as current by the setfont operator any show of a character images the figure associated with that character code For example you can create a font containing a corporate logo assigned to the character a The following PostScript example shows how the specific size of the logo font is assigned a name within a master and how the logo is placed on a page Logo XYZCorpLogos findfont 20 scalefont def Logo setfont 50 50 moveto a show XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 5 POSTSCRIPT PostScript with embedded PJL commands PostScript files created for some Hewlett Packard printers and other compatible printers include PJL commands that specify the use of a PostScript interpreter DocuPrint NPS can recognize a file as PostScript if it starts with code similar to the following N 12345X PUL ENTER LANGUAGE POSTSCRIPT Other PUL commands can be included at the start of the job but will be ignored Note PJL commands in locations other than at the start of the PostScript job will cause the job to be aborted PostScr
78. rite black 2 12 2 13 2 21 write white 2 12 2 13 enhancement resolution 2 10 2 13 EOF delimiters 2 14 2 16 error limitcheck 2 25 undefined command 2 14 Execution Dictionary operators 2 9 exitserver operator 2 16 2 18 extensions proprietary PostScript 2 13 F fast scan direction 2 27 2 28 2 30 fax resolution 2 27 features device dependent 2 23 2 26 file PPD 2 23 file operator 2 24 2 25 fill operator 2 19 2 21 filter operator 2 17 2 27 floating point operators 2 1 flushing input data 2 16 fonts cache size 2 26 Chinese 2 2 consistency 2 13 creating 2 5 default 2 3 double byte 2 2 error messages 2 18 HP PCL 5 1 4 Intellifont 1 3 loading 2 3 2 5 MICR 1 3 2 2 selecting 1 4 Type 0 2 2 installing 2 2 Type 1 installing 2 3 using 2 4 2 6 Type 3 2 2 installing 2 2 user defined 2 3 fonts MICR 1 3 G graphics bitmap 2 4 2 12 raster 1 2 vector 1 2 gray values rendering 2 22 H halftoning 2 10 2 22 handwritten test masters 2 1 hotlines ozone information iii safety iv HP PCL 5 fonts 1 4 IdleTime Dictionary operators 2 8 illegal characters ignoring 2 15 2 16 image characteristics 2 12 coordinates transforming 2 32 data order optimizing 2 28 2 32 embedding 2 27 2 33 orientation 2 28 post enhancement 2 12 pre enhancement 2 12 quality maintaining 1 1 1 2 2 10 2 13 rendering 2 29 rotating 2 28 2 29 s
79. sing and how DocuPrint NPS interprets various PCL commands PJL commands DocuPrint NPS does not support Printer Job Language PJL commands embedded within a job When PJL commands are embedded within a PCL job the job prints but the PUL commands are ignored Note PJL commands specifying the resolution of the job are J ignored This can cause a PCL job to be printed at an incorrect resolution Use the DefaultResolution option or the virtual printer to specify the correct resolution J PCL Copy command DocuPrint s behavior with the PCL Copy command lt ESX gt amp l X differs slightly from the behavior of the HP LaserJet 4si or Color LaserJet This section describes these differences If a document is printed as simplex the behavior of the HP LaserJet Asi or Color LaserJet and the DocuPrint NPS is nearly identical except that DocuPrint collates the copy output when one copy command is used to print copies of multiple output pages The following is an example for a 9 page document with a 3 copies command on page 2 a 2 copies command on pages 6 and 7 and a 1 copy command on page 8 Table 1 3 PCL Copy command example DocuPrint NPS collated output simplex HP LaserJet output simplex Sheet 1 PAGE 1 simplex command Sheet 1 PAGE 1 simplex command Sheet 2 PAGE 2 lt ESC gt amp l3X 3 copies Sheet 2 PAGE 2 lt ESC gt amp l3X 3 copies Sheet 3 PAGE 3 no copy command Sh
80. sion so that if Media List A4 blue A4 white A4 green A4 yellow then Esc amp l1H selects A4 blue Esc amp l2H selects A4 white Esc amp l3H selects A4 green Esc amp l4H selects A4 yellow Media list is the list of media assigned to the Media document attribute Note Refer to the Xerox DocuPrint Network Printer Series Guide to Managing Print Jobs for information on using virtual printers to create media lists 7 Tray assignments are independent so that if the trays are set as Tray 1 A4 white Tray 2 A4 yellow Tray 3 A4 blue Tray 4 A4 green then Esc amp l1H selecting A4 blue will use Tray 3 Esc amp I2H selecting A4 white will use Tray 1 Esc amp I3H selecting A4 green will use Tray 4 Esc amp l4H selecting A4 yellow will use Tray 2 When Esc amp lOH is used at the start of the job then media 1 is used otherwise it uses the media previously selected Note If an HP LaserJet driver is used that does not support certain media for example manual or envelope feeders it may be difficult to specify that media in the media list 74 Precedence in selecting media When more than one method of specifying media is used for the same page the order of precedence used by the system to select the medium is 1 ExceptionPages attribute 2 PCL Paper Source command 3 PCL Page Size command If a given page has a media exception that is the ExceptionPages attribute associated with it the
81. storage object size limits 2 26 Obsolete operators banddevice framedevice renderbands 2 26 Arc to Bezier conversion pathforall 2 26 Creating the necessary PostScript CCITT Group 3 and 4 2 27 Print performance related to image printing 2 27 Scan order and rotation 2 27 Purpose 2 28 Considerations 2 31 Summary 2 31 Scan resolution and scaling 2 32 3 VIPP 3 1 Functionality 3 2 Operating environment 3 2 VIPP line mode extension XGFNub 3 3 Index INDEX 1 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES vii TABLE OF CONTENTS viii XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES Introduction The Xerox DocuPrint Network Printing Series Guide to Using PDL describes how the PostScript HP PCL 5 and VIPP formerly XGF page description languages PDLs are implemented on the Xerox DocuPrint NPS printers About this guide This document is for users who will be submitting PostScript HP PCL 5 Decomposition Service and VIPP jobs to the DocuPrint printers These users should be familiar with the applications they are using to generate print jobs This document is also for PostScript HP PCL 5 and VIPP programmers who will be creating applications since it defines the features that are not supported for each PDL It is assumed that these programmers have a working knowledge of the language they are working in For specific reference inform
82. t 2 5 Using a Type 1 font in a document 2 5 PostScript with embedded PJL commands 2 6 PostScript language extensions 2 6 System Dict 2 6 User Dict 2 7 Server Dict 2 7 Status Dict 2 8 Miscellaneous IdleTime Dict Printer Dict and Execution Dict 2 8 IdleTime Dictionary 2 8 Printer Dictionary 2 9 Execution Dictionary 2 9 Nonstandard definitions 2 9 Examples of nonstandard definitions 2 10 Appearance consistency 2 10 Printer resolution and resolution enhancement 2 10 Printer imaging characteristics 2 12 Font consistency 2 13 Proprietary PostScript extensions 2 13 Control D as binary data and end of job 2 14 Control Z and superfluous errors 2 14 Solution to control Z and control D problems 2 15 Multiple jobs in one input file 2 16 DocuPrint NPS implementation of PostScript Level 2 2 17 Simulated mixed plex 2 17 Printer Controller operations 2 18 Scan conversion details 2 18 Stroke 2 18 Fill 2 19 Shapes 2 19 Zero width lines strokes 2 20 vi XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES TABLE OF CONTENTS Curved shapes 2 20 Images 2 20 Image quality 2 21 Rendering of color and gray values transfer function 2 22 PostScript printer description PPD files 2 23 Implementation limits 2 23 File operators and standard devices 2 24 Path limits 2 25 PostScript VM limits 2 25 SetCacheDevice 2 25 Device orientation and setscreen operator 2 25 PostScript
83. t that produces the same output as the previous fragment XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 33 POSTSCRIPT Figure 2 13 PostScript with embedded image reordered data for optimum scan example oe PS Adobe 3 0 G4 example ps Example using embedded CCITT group 4 G4 data oe oe oe For optimal printing speeds the scan data should be aligned with the printing orientation which scans the long edge of the page Fast scan direction for the image is bottom to top across the page Slow scan direction for the image is left to right down the page oP ol oe m To get this data for a normal portrait oriented image scan it as landscape with the original rotated 90 degrees clockwise This can also be done as a post pass on the scan data oP ol oe oe This scan direction requires no internal rotation for DocuPrint printers although the PostScript code has a 90 degree rotation counterclockwise to compensate for the rotation performed in the oe oe oe scan step save o Rotate to the printer orientation clippath pathbbox gt 11x 11y urx ury maxY exch def maxX exch def minY exch def minX exch def centerX maxX minX add 0 5 mul def centerY maxY minY add 0 5 mul def centerX centerY translate 90 rotate centerY neg centerX neg translate bpl res div 72 mul lines res div 72 mul scale bpl lines useMask false 1 ifelse bpl 0 0 lines neg
84. thin the PostScript file Q User defined fonts can contain bitmaps or define the shape of characters through PostScript operators lineto curveto fill User defined bitmap fonts are not portable across different output devices You may notice a marked difference in the quality of rendering for bitmap fonts as printed on different laser printers The differences are attributable to device dependent features such as resolution shape of device pixels and other characteristics For further information on these characteristics see Scan conversion details in this chapter XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 3 POSTSCRIPT Type 1 fonts Type 1 fonts are base fonts with character shapes defined by using specially encoded PostScript procedures Because characters are drawn by PostScript procedures many visual elements that are not associated with fonts can be represented as characters in a Type 1 font The multiple master font format is an extension of the Adobe Type 1 font format and is supported by DocuPrint NPS Refer to the Adobe PostScript Language Reference Manual for more information and the Adobe Type 1 Font Format document for encoding information Type 1 fonts are available on DOS formatted diskettes and can be loaded on the DocuPrint system using the font installation utility According to the Adobe Type 1 Font Format a conforming Type 1 font program contains the following first
85. this chapter these operators allow you to bypass the save or restore context around each PostScript job These changes can be reset only by stopping and restarting job processing XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 7 POSTSCRIPT Status Dict Server Dictionary entries that contain defined values and routines to mimic the LaserWriter but are not used by DocuPrint include baud25 baud9 execjob parity25 parity9 secretdict setrealdevice No other Server Dictionary operators defined in the LaserWriter are implemented in DocuPrint 1 5 and higher The following Status Dictionary entries are implemented checkpassword dostartpage jobname jobstate jobsource idlefonts margins printername product revision setpassword setmargins setdostartpage setidlefonts setprintername The following Status Dictionary entries contain defined values or routines to mimic the LaserWriter but are not used by DocuPrint defaulttimeouts eerom eescratch jobtimeout manualfeed manualfeedtimeout pagecount pagestacktorder pagetype prefeed printererror sccbatch sccinteractive setdefaulttimeouts seteescratch setjobtimeout setpagetype setsccbatch setsccinteractive waittimeout Miscellaneous IdleTime Dict Printer Dict and Execution Dict IdleTime Dictionary IdleTime Dictionary idleTimeDict entries that are implemented include dfitkidleArry needflush The following idleTi
86. transfer function PostScript devices approximate source color values by a sampling and halftoning technique These values can be modified by changing the output transfer function The transfer function permits the correction of color including gray values to compensate for nonlinear color and gray level response in both an output device and the human eye The color levels presented to the setcmykcolor sethsbcolor setrgbcolor and setgray operators and appearing as sampled data are not used directly but are mapped through the current transfer functions The resulting output consists of combinations of black and white on the DocuPrint monochrome printer and black white and highlight color on the DocuPrint highlight color printers Note The internal default transfer function in DocuPrint cannot be J bypassed Currently there is an internal table that is used for converting input requests for a color value to a different number that is used to set the output device color level 7 On the DocuPrint monochrome printer PostScript masters that rely on the null transfer function null transfer function is settransfer do not overwrite the internal transfer function Furthermore the operator currenttransfer returns what appears to be a null transfer function that is However the internal transfer function is not null This achieves compatibility because the xerography differs between DocuPrint and LaserWriter Note For
87. tters that depend on the PostScript interpreter for padding of the bounding box create PostScript masters that can result in blank pixels Device orientation and setscreen operator Due to differences between the device coordinate systems in DocuPrint NPS and those in the LaserWriter or a typical desktop printer the use of the setscreen operator produces different results between printers Figure 2 6 DocuPrint device coordinate Y axis X axis Long edge fast scan 11 Y axis Slow scan paper movement 8 5 X axis XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 25 POSTSCRIPT Figure 2 7 Typical desktop printer device coordinate Slow scan paper movement 11 Y axis Short edge fast scan 8 5 X axis X axis PostScript storage object size limits The two main PostScript storage objects are the font cache and virtual memory VM which stores composite PostScript data structures such as the user and system dictionaries The font cache VM and data structures in VM do not have standard sizes Therefore test masters that print out these object sizes are useless for testing consistency across different PostScript printers A small font cache size does not normally cause a PostScript master to fail it should affect only performance Refer to the PostScript Language Reference Manual for typical memory limits for PostScript products These limits should be co
88. udes an electronic version the DocuPrint NPS Interactive Customer Documentation CD Related information You can locate additional information related to PostScript or HP PCL 5 in the publications listed in this section For a complete list and description of available documentation refer to the Xerox Documentation Catalog or call the Xerox Documentation and Software Services at 1 800 445 5554 for ordering information in the United States For customers outside the United States contact your local Xerox operating company PostScript publications The following is a list of PostScript publications e PostScript Language Reference Manual first edition sixth printing Addison Wesley April 1987 Adobe Systems Incorporated XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES xi INTRODUCTION HP PCL 5 publications PostScript Language Reference Manual second edition Addison Wesley January 1991 Adobe Systems Incorporated This document defines both PostScript Level 1 and Level 2 Adobe Type 1 Font Format 1990 Adobe Systems Incorporated LaserWriter Reference Addison Wesley October 1988 Apple Computer Incorporated PostScript Language Program Design 1988 Adobe Systems Incorporated PostScript Language Tutorial and Cookbook 1986 Adobe Systems Incorporated PostScript Printer Description File Format Specification Version 4 2 March 29 1994 Adobe Systems Incorporated Real World PostS
89. ure e Avoid using Logical Operation 136 in standalone mode PCL 5C highlight color has been tailored to accommodate a special way of using the Logical Operator sequence 136 90 generated by some applications Therefore using Logical Operation 136 may cause the output to print incorrectly 1 14 XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2 PostScript This chapter provides an overview of standard PostScript operations and guidelines for ensuring consistent printer output Implementation dependent operations The following operations are implementation dependent Floating point arithmetic and math operators Coordinate system default matrix All PostScript floating point arithmetic and math operators are implementation dependent if you use very large or very small floating point numbers This is rarely a problem with PostScript masters generated by real world creators that is commercial PostScript creators such as Word or Excel Handwritten test masters however can cause problems Some handwritten test masters print out the limits of floating point numbers and various floating point operations Because these values may vary based on the PostScript implementation the test master output also varies making these tests useless for testing consistency across different PostScript printers The PostScript current transformation matrix CTM controls the mapping of user coordinates to device c
90. utine Maintenance e Quotes Keywords you can enter as arguments appear in quotes for example USLetter e Vertical bars Alternatives to specified arguments are separated by vertical bars for example Set Time lt Time Remote Host Name IP Address gt Note Notes are hints that help you perform a task or understand the text L Caution Cautions alert you to an action that could damage hardware or software Q Warning Warnings alert you to conditions that may affect the safety of people XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES INTRODUCTION Related publications The Xerox DocuPrint Network Printer Series includes the following documents Decomposition Service and Tools Guide Guide to Configuring and Managing the System Guide to Managing Print Jobs Guide to Performing Routine Maintenance Guide to Submitting Jobs from the Client Guide to Using Page Description Language Installation Planning Guide Messages Guide System Overview Guide Troubleshooting Guide Glossary Master Index Customer Information Quick Reference Card Printer Controller Commands Quick Reference Card Submitting your Jobs from Macintosh Quick Reference Card Submitting your Jobs from UNIX amp DOS Quick Reference Card Submitting your Jobs from Windows NT 4 0 QuickPrint Quick Reference Card Submitting your Jobs Using Windows NT 4 0 Drivers Quick Reference Card The documentation set also incl

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