Xref: utzoo comp.sys.mac:20913 comp.lang.postscript:1019 comp.sys.mac.programmer:2562
Path: utzoo!attcan!uunet!munnari!otc!metro!basser!usage!elecvax!spinifex!gordon
From: gordon@spinifex.eecs.unsw.oz (Gordon Rowell)
Newsgroups: comp.sys.mac,comp.lang.postscript,comp.sys.mac.programmer
Subject: Re: Is run-length compression possible in PostScript?
Summary: Run length limiting is possible, and has been done (e.g. Sun2PS and X11 version of xpr)
Message-ID: <308@spinifex.eecs.unsw.oz>
Date: 27 Sep 88 00:36:45 GMT
References: <260@rna.UUCP>
Organization: EE & CS, Uni N.S.W., Sydney, Australia
Lines: 16

In article <260@rna.UUCP>, marc@rna.UUCP (Marc Johnson) writes:
> I am producing bitmapped images on a LaserWriter Plus using PostScript,
> noteably the "image" operator.  The image data can get huge, and I would
> like to do run-length compression.  Anybody know how if this is possible
> using the "image" operator, or any other method in PostScript?
> 

There are two examples that I know of. Sun2PS, which takes Sun format
windows and generates PostScript images from them, and the X11 version
of xpr. Both use RLL encoding to generate much smaller (e.g. ~30% size)
files. Check with a site near you that has Suns or X11, or they
can be posted if needed. (BTW I have made an X10 version for anyone who
is interested).
		Gordon Rowell	(gordon@spinifex.eecs.unsw.oz)
		Department of Computer Science, 
		University of N.S.W., Sydney, Australia