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From: mark@masscomp.westford.ccur.com (Mark Thompson)
Newsgroups: comp.sys.amiga.graphics
Subject: need 24bit->8bit quantizer with "locked" colormap/pallete
Message-ID: <62130@masscomp.westford.ccur.com>
Date: 6 Jun 91 20:31:58 GMT
Organization: Concurrent Computer Corp. Westford MA.
Lines: 25

I am working on a demo of X11 image load speed on a system at work and I
need to do the appropriate conversion to get a LightWave generated
animation into an 8bit pseudo color format with a constant color pallete.
Does anybody know of a method to quantize a series of 24bit images to
8bits using the same colormap for all the images in the sequence (based
on maybe the first image or whatever)? I need to do this on a unix/X based
workstation or an Amiga. I had hoped xv or the pbmplus tools had this 
capability but they don't appear to as far as I can tell. A friend of mine
who owns ADPro claims that it can do this, but the GIFs I have seen ADPro
create look terrible compared to the ones I have converted using the PD X11
program xv. Is it possible he did his conversions improperly. He said he
selected a pallete of 256 colors. Anyway, the 8bit output format doesn't
matter provided it is color and I can use pbmplus to convert it to binary
ppm format. The input 24bit format can either be Amiga IFF24, ppm binary,
or raw RGB. I'll probably end up writing my own code to do this but I thought
I'd check first.

Thanks for any pointers or help.
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