ImportImage dropping colormap from GIF's, etc

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1 total messages Started by Scott Ferguson Wed, 30 Dec 1992 18:18

#218

Author: Scott Ferguson
Date: Wed, 30 Dec 1992 18:18

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Well, I'm mired in trying to get the ImportImage module to actually
use the color tables from pseudocolor image files. I've gone out to
sdsc.edu and gotten both 2.0 and 2.1 versions of imtools. No matter
which one I load into the ImportImage Module, we still get no color maps.
What we seem to get is the actual pixel number, since a 256-color GIF
looks like a greyscale image, but a 16-color gif is very dark, so the numbers
1-16 get stuffed into all 3 red,green, and blue channels.

Unfortunately the imtools and libsdsc distributions come with some but not 
all source, so I can't check the contents of the ImVfbQGreen(sourceVfb,vptr) 
calls to see what should be going on. 

The run-time imtools program imconv does properly convert my gifs so that
I can convert a gif to an SGI RGB and then load it into explorer with ReadImg,
so there must be something wrong with the way ReadSDSC.c is reading the images,
or there's a bug in either the libim.a or the libsdsc.a.

I'll keep at it and keep you posted, or if anyone else has seen this behavior
and fixed it please pipe up.

-- 
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Scott Ferguson                        Exxon Research & Engineering Co.
Project Engineer                      New Jersey
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"Always bark at a dog."

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