Path: 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:Date: 29 Jun 88 06:26:32 GMT Organization: Carnegie Mellon Lines: 12 In-Reply-To: <174@chip.UUCP> 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