Screening Procedures

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Article #7259

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#7259

From: Simon Peter Gatrall
Date: Wed, 29 Jun 1988 06:26

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I've been interested in playing with the procedures PostScript uses to do
halftoning, and I was wondering if anyone else is familiar with this stuff.
One thing that bothers me is that once a pattern is made to represent a
specific gray value, it isn't recomputed.  This makes all the sense in the
world for line and dot screens, but what if you want something that looks like
a texture?  How do you make a circular line screen?

Personally it seems to me that Adobe has made it so that you can redefine the
screen operator, but not in a useful way.  Has anybody out there come up with
neat effects using screen redefintion?

-Simon Gatrall                  sg1q+@andrew.cmu.edu

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!uw-beaver!cornell!rochester!pt.cs.cmu.edu!andrew.cmu.edu!sg1q+
From: sg1q+@andrew.cmu.edu (Simon Peter Gatrall)
Newsgroups: comp.lang.postscript
Subject: Screening Procedures
Message-ID: <cWm8qMy00Xc8sPk0iw@andrew.cmu.edu>
Date: 29 Jun 88 06:26:32 GMT
Organization: Carnegie Mellon
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