.\" Copyright (c) 2001-2003 Leon Bottou, Yann Le Cun, Patrick Haffner, .\" Copyright (c) 2001 AT&T Corp., and Lizardtech, Inc. .\" .\" This is free documentation; you can redistribute it and/or .\" modify it under the terms of the GNU General Public License as .\" published by the Free Software Foundation; either version 2 of .\" the License, or (at your option) any later version. .\" .\" The GNU General Public License's references to "object code" .\" and "executables" are to be interpreted as the output of any .\" document formatting or typesetting system, including .\" intermediate and printed output. .\" .\" This manual is distributed in the hope that it will be useful, .\" but WITHOUT ANY WARRANTY; without even the implied warranty of .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the .\" GNU General Public License for more details. .\" .\" You should have received a copy of the GNU General Public .\" License along with this manual. Otherwise check the web site .\" of the Free Software Foundation at http://www.fsf.org. .TH DJVUDIGITAL 1 "1/31/2004" "DjVuLibre-3.5" "DjVuLibre-3.5" .SH NAME djvudigital \- creates DjVu files from PS or PDF files. .SH SYNOPSIS .BI "djvudigital [" "options" "] " "inputfile" " [" "outputfile" "]" .SH DESCRIPTION This program creates a DjVu file from the PostScript .BR "" "(" ".ps" ")," GZipped PostScript .BR "" "(" ".ps.gz" ")," Encapsulated PostScript .BR "" "(" ".eps" ")," or Portable Document Format .BR "" "(" ".pdf" ")" file .IR inputfile . The output file name is either given by argument .I outputfile or generated by replacing the input file name suffixes by the DjVu suffix .BR "" "(" ".djvu" ")." .SH PREREQUISITES This program depends on a specific GhostScript driver. If your GhostScript program does not provide this driver, please check .BR http://djvu.sourceforge.net/gsdjvu.html . .SH OPTIONS .TP .BR "--verbose" ", " "-v" Displays more informational messages while converting the file. .TP .BR "--quiet" ", " "-q" Do not display informational messages while converting the file. .TP .BI "--dpi=" "resolution" Specify the desired resolution to .I resolution dots per inch. The default is 300 dpi. .TP .BI "--psrotate=" "angle" Rotate the PostScript file by .I angle degrees clockwise. Only the values .BR 0 ", " 90 ", " 180 ", and " 270 are supported. This option only applies to PostScript files. PDF files are always converted according to their native orientation. .TP .BI "--epsf=" "disposition" Specify how to handle Encapsulated PostScript files. Argument .I disposition can take the values .BR crop ", " fit ", and " ignore "." The default disposition .B crop creates a DjVu file whose size matches the bounding box of the Encapsulated PostScript file. Value .B fit rescales the graphics to the default page size. Value .B ignore disables all Encapsulated PostScript specific code. This option requires Ghostscript 7.07 or better. .TP .BI "--exact-color" Enables a more accurate rendering of the colors. This option requires GhostScript 6.52 or better. .TP .BI "--threshold=" "thres" Specify a threshold for the foreground/background separation code. Acceptable values of .I thres range from 0 to 100. Larger values place more information into the foreground layer. The default threshold value is 80. .TP .BI "--bg-subsample=" "sub" Specify the background subsampling ratio. Argument .I sub must be an integer between 1 and 6. The default value is 3. .TP .BI "--bg-slices=" "n" "+...+" "n" Specify the encoding quality of the background layer. The syntax for the argument is similar to that described for the .B -slice option of command .BR c44 . The default is .BR 72+11+10+10 . .TP .BI "--fg-colors=" ncolors Specify the maximum number of distinct colors in the foreground layer. Argument .I ncolors can take integer values between 1 and 4000. The default value is 256. .TP .BI "--fg-image-colors=" ncolors Specify the maximum number of distinct colors in an image for considering encoding it into the foreground layer. Argument .I ncolors can take integer values between 1 and 4000. The default value is 256. .TP .BI "--words" Extract the text from the PostScript code and incorporates this information into the DjVu file. This option records the location of every word. .TP .BI "--lines" Extract the text from the PostScript code and incorporates this information into the DjVu file. This option saves a few bytes by only recording the location of each line. .TP .BI "--gsarg=" arg1 "[," arg2 ",...," argN "]" Insert extra arguments on the GhostScript command line. .TP .BI "--cseparg=" arg1 "[," arg2 ",...," argN "]" Insert extra arguments on the command line of program .BR csepdjvu " or " msepdjvu "." .TP .BI "--poppler=" "keywords" This option causes .B djvudigital to extract additional information from PDF files using the tool .B pdftotext that comes bundled with the Poppler library. Selected information is then added to the djvu file as a postprocessing step. This option is ignored when the input file is not a PDF file. Argument .I keywords is a comma separated list of keywords. When this list contains keyword .BR meta , the metadata extracted by .B pdftotext is inserted into the djvu file. When this list contains keyword .BR text , the textual information extracted by .B pdftotext is inserted into the djvu file, possibly replacing the information gathered using the options .BR --words or .BR --lines . This is useful for instance when a scanned PDF file contains a hidden text layer that is not recognized by Ghostscript and therefore not passed to the djvudigital backend. .TP .BI "--sepfile" Produces a separated data file instead of a DjVu file. Program .BR csepdjvu can then convert the separated data file into a DjVu file. .TP .BI "--check" Display the names of the two auxiliary programs found by .BR djvudigital , namely a suitable ghostscript interpreter and a suitable backend encoder. See the next two section for details. .TP .BI "--dryrun" Simply display the ghostscript command line generated by .BR djvudigital without running it. No output file is produced .TP .BI "--help" Display the manual page for .BR djvudigital . .PP .SH GHOSTSCRIPT ISSUES Program .B djvudigital internally relies on a specific Ghostscript driver named .BR djvusep . This driver analyzes the logical structure of the sequence of PostScript rendering commands and decides to execute each command into either the foreground or the background layer. The GhostScript driver produces a separated data file that is then compressed using the DjVuLibre program .BR csepdjvu . Before processing the input file, program .B djvudigital searches a Ghostscript executable providing the .B djvusep driver. The search starts with the file specified by the environment variable .B GSDJVU and continues with command line executables named .BR gs " and " gsdjvu "." The DjVuLibre source code contains instruction to compile such a GhostScript executable. More information can be obtained from .BR http://djvu.sourceforge.net/gsdjvu.html . .SH CSEPDJVU ISSUES The output of the .B djvusep GhostScript driver must be processed by the DjVuLibre program .BR csepdjvu . This program can also be replaced by the the proprietary Lizardtech program .BR msepdjvu . Before processing the input file, program .B djvudigital searches such an executable. The search starts with the file specified by the environment variable .B CSEPDJVU and continues with command line executables named .BR msepdjvu " and " csepdjvu "." .SH OTHER PROGRAMS The option .BI "--poppler=" "keywords" relies on the tool .B pdftotext that comes with the Poppler library and the tool .B djvused that comes with djvulibre. Only recent versions of .B pdftotext that accept the option .B -bbox are supported. Both tools are searched by first trying the files specified by the environment variables .B PDFTOTEXT and .BR DJVUSED , and then trying executables named .B pdftotext or .B djvused found along the shell executable path. .SH CREDITS The first version of this converter was written by L\('eon Bottou in AT&T Labs. The DjVuLibre version is derived from code graciously released by Lizardtech in January 2004. .SH BUGS Program .B djvudigital can only process input files that GhostScript can process properly. .SH SEE ALSO .BR djvu (1), .BR csepdjvu (1), .BR c44 (1), .BR gs (1), .BR gzip (1)