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From: perry@madnix.UUCP (Perry Kivolowitz)
Newsgroups: comp.sys.amiga.graphics
Subject: Re: need 24bit->8bit quantizer with "locked" colormap/pallete
Summary: ADPro, ADPro, ADPro
Message-ID: <1863@madnix.UUCP>
Date: 11 Jun 91 02:56:58 GMT
References: <62130@masscomp.westford.ccur.com>
Reply-To: perry@madnix.UUCP (Perry Kivolowitz)
Organization: ASDG Incorporated
Lines: 28

In article <62130@masscomp.westford.ccur.com> mark@masscomp.westford.ccur.com (Mark Thompson) writes:
>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)? 

ADPro will do this, quite easily in fact.

>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. 

It is quite likely that your friend did not make use of the enhanced palette
mode which means that the 256 color GIFs he produced had no more dynamic
range than the AMIGA can handle (12 bits). By using the enhanced palette
mode, ADPro's color picking is allowed to choose from colors which would
be indistinguishable on the AMIGA (ie: colors which vary beyond the 12
bit level). This results in a visually better image on display devices
which can handle the greater dynamic range.


-- 
Perry Kivolowitz, ASDG Inc. ``We look for things. Things that make us go.''
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