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1991-04-10
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DESCRIPTION
These scripts allow arbitrary PostScript to be converted to
Encapsulated PostScript with a bitmap (EPS, EPSI, EPSF). The real
work has been done by the authors of PBMPLUS (Jef Poskanzer),
GhostScript (L. Peter Deutsch), and OpenWindows (Sun). All I have
done is supply some glue to put all of these other applications to
work. It is beyond me why it has not been done before, especially
considering the number of requests (pleas) for such a conversion
program.
I am providing these scripts with no guarantee, but will maintain them
and fix bugs if you send them.
Doug Crabill
dgc@cs.purdue.edu
REQUIREMENTS
You must have the PBMPLUS utilities.
You must have either OpenWindows, GhostScript, or both.
PBMPLUS is available via anonymous ftp from export.lcs.mit.edu in
contrib/pbmplus.tar.Z, OpenWindows is available from Sun, and
GhostScript is available via anonymous ftp from prep.ai.mit.edu in
pub/gnu/ghostscript-2.1.1.tar.Z (watch for newer versions).
INSTALLATION
Drop pbmtoepsi.c into the pbmplus source (in the pbm subdirectory),
add it to the Makefile, and make. Put the executable with the other
pbm binaries.
Put pstorast (formerly pstobits, posted by someone else in the past --
don't remember who) in an appropriate location (/usr/local/bin, or
whatever).
Edit pstoepsi and change all of the variables at the top so they match
your local configuration.
HOW TO USE IT
Read the pstoepsi shell script for usage.
HOW IT WORKS
The conversion works by interpreting the source PostScript using
either X/NeWS (provided with OpenWindows) in batch mode or GhostScript
in batch mode, converting the result into a portable bitmap, running it
through pbmtoepsi, which converts it to a PostScript style bitmap
complete with bounding box information, and concatenating the result
with the original PostScript.
Using X/NeWS for the conversion generally takes longer, but yields a
sharper bitmap than with GhostScript. It is convenient to have both
available because occasionally you will want to convert PostScript
which will cause one or other of the interpreters to fail. If you
want to encapsulate PostScript which already thinks it is
encapsulated, you should probably use the "-strip" option to pstoepsi.
This will strip out all of the old encapsulation and add new
encapsulation.
Doug Crabill
Department of Computer Science
Purdue University
dgc@cs.purdue.edu