Path: utzoo!utgpu!cunews!bnrgate!bigsur!bnr-rsc!bcarh188!lalibert
From: lalibert@bcarh188.bnr.ca (Luc Laliberte)
Newsgroups: comp.arch
Subject: Re: Resolution, etc.
Message-ID: <3754@bnr-rsc.UUCP>
Date: 26 Nov 90 14:33:04 GMT
References: <240@csinc.UUCP> <1990Nov15.052925.1265@imax.com> <2928@crdos1.crd.ge.COM> <1990Nov19.195042.19240@imax.com> <4027@osc.COM>
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I spent the weekend converting a 24bit image to GIF format, without
dithering.  Instead, I took the most significant 5 bits of each color
and ran it through a 2 pass color compression algorithm to reduce the
number of colors required to 256.  The process is expensive in CPU
time but the results are worth it.  The final picture looks like it
has been anti-aliased and lacks any banding.  Note, I've never seen
the picture in 24bit format, but the final result is comparable to
other high quality GIFs I have seen.
  Eric