man a2ping.pl (1): convert between PS, EPS and PDF and other page description

SYNOPSIS

a2ping.pl [--]help
a2ping.pl [--]doc
a2ping.pl [options] <inputfile> [[outformat:] outputfile]

DESCRIPTION

a2ping is a UNIX command line utility written in Perl that converts many raster image and vector graphics formats to EPS or PDF and other page description formats. Accepted input file formats are: PS (PostScript), EPS, PDF, PNG, JPEG, TIFF, PNM, BMP, GIF, LBM, XPM, PCX, TGA. Accepted output formats are: EPS, PCL5, PDF, PDF1, PBM, PGM, PPM, PS, markedEPS, markedPS, PNG, XWD, BMP, TIFF, JPEG, GIF, XPM. a2ping delegates the low-level work to Ghostscript (GS), pdftops and sam2p. a2ping fixes many glitches during the EPS to EPS conversion, so its output is often more compatible and better embeddable than its input.

Without the "--below" option, it is guarenteed to start at the 0,0 coordinate. "--below", "--hires" and "-v" are recommended options.

The page size is set exactly corresponding to the BoundingBox. This means that when Ghostscript renders it, the result needs no cropping, and the PDF MediaBox is correct.

If the bounding box is not right, of course, you have problems. If you feed crap in, you get crap. But you can supply the --bboxfrom=compute-gs option to make GS recompute the bounding box.

The name of the input file doesn't matter --- a2ping detects the file format based on the first few bytes of the file. The name of the output file matters if outformat is missing from the command line: then the extension of the output file determines the FileFormat (outformat).

EXTERNAL PROGRAMS

The internal file format of a2ping.pl is PS/EPS. Everything read is first converted to PS or EPS, then processed by a2ping.pl, then converted to the output format.

To analyse the bounding box and other properties of non-EPS PS files (and EPS files with option --bboxfrom other than =guess), GS is used. Converting PS to EPS involves this analysis.

To write PDF files, GS is used.

To read PDF files, pdftops from the xpdf package is used.

Sampled input formats are PNG, JPEG, TIFF, PNM, BMP, GIF, LBM, XPM, PCX and TGA. To read sampled input formats, sam2p is used. sam2p is a raster image converter written in C++ by the author of a2ping.pl.

Extra output formats are PNG, XWD, BMP, TIFF, JPEG, GIF and XPM. To write extra output formats, sam2p and GS are used.

PNM output formats are PGM, PGM and PPM. To write PNM output formats, GS is used.

TIPS AND TRICKS

Call with the -v option to see progress and debug messages.

If your EPS contains a wrong bounding box, you can fix it by running "a2ping.pl -v --bboxfrom=compute-gs thefile.eps --"

You can specify - as inputfile to get stdin and as outputfile to get stdout. This works even for PDF files (which must be seekable), because a2ping copies them to a temporary file automatically.

If inputfile and outputfile are the same, a2ping copies the inputfile to a temporary location first. However, this usage is recommended only if there is a backup of the file to be restored in case a2ping doesn't produce the desired result.

If you specify -- as outputfile, it will be the same as inputfile.

a2ping respects --Duplex for FileFormat PCL5, even though GS doesn't.

If you have an incompatible PS that GS can read but your printer cannot print, just run "a2ping.pl foo.ps PDF: - | a2ping.pl - PS: foo.ps"

If you have a PS coming from Win32 (often with extension ".prn"), run it through a2ping. It will remove the resolution changes and the progress text printed to the terminal (which confuses gv(1) and makes some filters in the print queue emit incorrect output).
a2ping does antialiasing (--antialias=scale3no) of glyphs and curves when emitting a sampled image (FileFormats such as PGM and PPM). This improves readability of the glyphs. =yes instructs GS to do internal antialiasing, but it usually doesn't improve much. =scale3no turns off GS internal antialiasing, but makes it render everything 3x3 as big, and then scales it back down. =scale3no turns on both 3x3 scaling and GS internal antialiasing, which results in thicker lines and worse quality in general.
When creating a PBM file, antialiasing usually doesn't improve the quality, so it is switched off by default. But if you set --antialias=scale3no or --antialias=scale3yes, GS will render a PGM file, and the value of --threshold determines the minimum intensity for white in the final PBM.
If you need a bigger sampled output file, specify a larger --Resolution. The default is --Resolution=72. If your sampled output file is going to be really big, you should specify --AntiAlias=yes instead of the default --AntiAlias=scale3no to speed up conversion.

MISC

Doesn't depend on the filename or extension of the input file.
Conversion from EPS to PDF: fixes glitches etc., calls gs -sDEVICE=pdfwrite
Conversion from EPS to EPS: fixes various glitches, moves (llx,lly) to (0,0), removes binary junk from the beginning of the EPS etc.
Conversion from PDF to PDF: keeps the file intact
Conversion from PDF to EPS: calls pdftops -eps (of the xpdf package)
Conversion from PS to EPS: keeps 1st page only, removes setpagedevice etc.

AUTHORS

The author of a2ping is Szab['o] P['e]ter <[email protected]>.

a2ping is inspired by and historically based on the epstopdf Perl script modified by Thomas Esser, Sept. 1998, but his modifications have been removed from a2ping, and also a2ping and epstopdf do not share common code anymore. epstopdf is written by Sebastian Rahtz, for Elsevier Science. epstopdf contained extra tricks from Hans Hagen's texutil.

HISTORY

1999/05/06 v2.5 (Heiko Oberdiek)

 * New options: --hires, --exact, --filter, --help.
 * Many cosmetics: title, usage, ...
 * New code for debug, warning, error
 * Detecting of cygwin perl
 * Scanning for %%{Hires,Exact,}BoundingBox.
 * Scanning only the header in order not to get a wrong
   BoundingBox of an included file.
 * (atend) supported.
 * uses strict; (earlier error detecting).
 * changed first comment from '%!PS' to '%!';
 * corrected (atend) pattern: '\s*\(atend\)'
 * using of $bbxpat in all BoundingBox cases,
   correct the first white space to '...Box:\s*$bb...'
 * corrected first line (one line instead of two before 'if 0;';

2000/11/05 v2.6 (Heiko Oberdiek)

 * %%HiresBoundingBox corrected to %%HiResBoundingBox

2001/03/05 v2.7 (Heiko Oberdiek)

 * Newline before grestore for the case that there is no
   whitespace at the end of the eps file.

2003/02/02 (Szab['o] P['e]ter)

 * option --below
 * removes DOS EPSF binary junk correctly
 * adds all 3 BoundingBox DSC comments
 * reads all 3 BoundingBox DSC comments, and picks the best
 * forces BoundingBox to be an integer
 * adds %%EndComments and proper %!PS-Adobe-?-? EPSF-?.? header
 * adds %%Pages:
 * adds invocation syntax: a2ping <infile.eps> <outfile.eps|pdf>
 * can convert PDF to EPS (by calling pdftops(1)) and PDF to PDF
 * emulates work for PDF input

2003/04/16 (Szab['o] P['e]ter)

 * added PS and sam2p support, renamed to a2ping
 * sam2p and pdftops if $InputFilename eq '-';
 * remove PJL UEL header from the beginning
 * works for PS non-EPS files for input
 * input support for PNG JPEG TIFF PNM BMP GIF LBM XPM PCX TGA via sam2p
 * removes ^L (form feed) from end of EPS file
 * -x=-c:rle to add sam2p options

2003/04/26 (Szab['o] P['e]ter)

 * omit the unnecessary setpagedevice calls when creating normal eps
 * --noverbose --nocompress supported differently
 * no more option defaults :-(
 * justlib2
 * multi-page output with PS:, PDF:, PCL5:
 * after `a2ping -pa4', file out.pcl says: `HP PCL printer data - A4 page
   size', instead of `US letter'
 * justlib2-ified doesn't depend on Getopt::Long anymore
 * fully supports filtering (stdin and/or stdout), PDF and PCL5 output to
   pipe (!$$ll_zero)
 * adds DSC ``%%DocumentMedia: plain 612 792 0 () ()''
 * BoundingBox precedence for EPS input: --PageSize, %%*BoundingBox,
   setpagedevice. Precedence for other inputs: --PageSize, setpagedevice,
   %%*BoundingBox

2003/09/25 (Szab['o] P['e]ter)

 * --bboxfrom=adsc: %%BoundingBox overrides -sDEVICE=bbox
 * improved bbox discovery
 * many bugfixes
 * MetaPost EPS input fixes for prologues:=0;
 * a2ping.pl -v --papersize=50,60 --bboxfrom=compute-gs t.ps t2.ps
 * consistent bbox, --PageSize, /PageSize handling
 * consistent --Resolution and --Duplex handling

2003/12/02 (Szab['o] P['e]ter)

 * --bboxfrom=compute-gs option to fix PS -> EPS bbox (gs -sDEVICE=bbox), tuzv.eps

2004/02/10 v2.77 (Szab['o] P['e]ter)

 * the compute-pipe routine is now run unless --bboxfrom=guess with EPS
 * added --gsextra=
 * added --antialias=
 * added FileFormat PBM, PGM, PPM
 * separated FileFormat features to FL_* constants
 * added --doc
 * there is no default FileFormat (PDF) anymore