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From: barnett@crdgw1.crd.ge.com (Bruce Barnett)
Newsgroups: comp.lang.postscript
Subject: Color Dithering options?
Message-ID: <3530@crdgw1.crd.ge.com>
Date: 24 Oct 89 14:13:45 GMT
Sender: news@crdgw1.crd.ge.com
Reply-To: barnett@crdgw1.crd.ge.com (Bruce Barnett)
Organization: GE Corp. R & D, Schenectady, NY
Lines: 21

We have an application that required printing color images on
a PostScript printer. The printers we have seen all dither a single
color into a single pattern. Therefore blocks of color end up having
a repeating pattern.

	This interferes with the visual interpretation of the image.
We would like to use a better dithering algorithm that uses a
variety of patterns for the same shade.

	Of course we can dither the raster image ourselves and
then convert it into PostScript.

	The questions are:

		Is there any printer that uses such dithering techniques?

		Is there a way to do this in PostScript? If so, does it
		make more sense to do in in the host and not the printer?

--
Bruce G. Barnett	<barnett@crd.ge.com>   uunet!crdgw1!barnett