Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!rutgers!cmcl2!rna!dan
From: dan@rna.UUCP (Dan Ts'o)
Newsgroups: comp.graphics
Subject: 24-bit RGB color to 8-bit color ?
Message-ID: <538@rna.UUCP>
Date: 24 Apr 89 18:03:46 GMT
Organization: Rockefeller University - Neurobiology
Lines: 24


	Does anyone have a program to take an image with 24-bit color info
and build an 8-bit color map that is "good" (find the 256 color map entries
that produce the least error) ?

	Note that I am not asking for a 24->8 bit dithering program. It would
seem that the program I want must internally build a histogram of the
occurences of each of the 16M possibilities and then doles each of the
256 available entries according to overall minimum color error (ideally,
including psychophysical facts).

	Would the results be better in HSI space than RGB space ?

	Whoever builds those nice GIF images (GIF is only 8-bit) must have
such a program.

	Thanks.
				Cheers,
				Dan Ts'o		212-570-7671
				Dept. Neurobiology	dan@rna.rockefeller.edu
				Rockefeller Univ.	...cmcl2!rna!dan
				1230 York Ave.		rna!dan@nyu.edu
				NY, NY 10021		tso@rockefeller.arpa
							tso@rockvax.bitnet