Article View: comp.text.desktop
Article #641PostScript bitmaps
From: Chuq Von Rospach
Date: Mon, 01 Jun 1987 16:37
Date: Mon, 01 Jun 1987 16:37
26 lines
1622 bytes
1622 bytes
Date: Fri, 29 May 87 19:53:44 PDT
From: phw5!bellcore!phw
I have a fairly good PostScript compression program that produces ASCII-only
characters, with non-ASCII as an option (but not CTRL-t, CTRL-j, CTRL-d, etc.)
It works especially well with halftones and bitmaps that have lots of white
and black space, or repeated patterns. I get about a 4 to 1 compression
on TARGA halftones. It's especially good when you know that the output
device has a limited number of grayscales (like the LaserWriter with 32),
as you can do a little of the halftoning on the host by rounding the bytes
to some number of grays that is slightly greater than the number you're
getting (factoring in, of course, any scaling that is performed on the
image). h
Pat Wood
bellcore!phw5!phw
bellcore.com!phw5!phw
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Chuq Von Rospach chuq@sun.COM Delphi: CHUQ
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!rutgers!ames!oliveb!sun!plaid!chuq From: chuq%plaid@Sun.COM (Chuq Von Rospach) Newsgroups: comp.text.desktop Subject: PostScript bitmaps Message-ID: <20098@sun.uucp> Date: Mon, 1-Jun-87 12:37:02 EDT Article-I.D.: sun.20098 Posted: Mon Jun 1 12:37:02 1987 Date-Received: Wed, 3-Jun-87 01:17:29 EDT Sender: news@sun.uucp Distribution: comp Lines: 26 Approved: desktop-request%plaid@sun.com