Xref: utzoo comp.graphics:13203 alt.graphics.pixutils:246
Path: utzoo!utgpu!cs.utexas.edu!uwm.edu!rpi!sigma
From: sigma@pawl.rpi.edu (Kevin J Martin)
Newsgroups: comp.graphics,alt.graphics.pixutils
Subject: Re: Anyone handle TIFF images with response curves?
Message-ID: <TL'%YC*@rpi.edu>
Date: 6 Sep 90 21:16:54 GMT
References: <50230003@hpcupt1.HP.COM>
Organization: Rensselaer Polytechnic Institute, Troy NY
Lines: 15

dclaar@hpcupt1.HP.COM (Doug Claar) writes:
>I noticed that neither the PBMPLUS utilities nor the FBM utilities
>handle TIFF images with grey/color response curves. Has anyone 
>written a TIFF to {something} converter that doesn't just grab the
>raw bits? (The grey response curve indicates the actual value of each
>level of grey. I believe that this is called 'gamma correction'? For
>example, the actual mappings might be 0 10 50 100 for a 4 level grey image).

Incidentally, can anyone explain that 'gamma factor' a little better than
what I've seen in the TIFF specification?  Examples would be good.

And how much does it matter on 64-grayscale VGA?

-- 
Kevin Martin  |||  sigma@pawl.rpi.edu  |||  usergkj1@RPITSMTS.BITNET