making slides

mike camann camann at pick.uga.edu
Wed Jan 19 14:58:14 EST 1994


GRASS users--

Has anyone succeeded in making slides directly from GRASS images, as
opposed to photographing the screen?  If so, how did you do it?

I have just tried making an X window dump, then using pbmplus to
convert the result to a TIFF file for importation into Harvard
Graphics, e.g.:

d.rast my_map
xwd | xwdtopnm | pnmtotiff > my_map.tif

I then point the PC at my_map.tif and HG imports it without difficulty,
but the colors are all messed up.  The original image had 100 colors,
but xwdtopnm reports finding only 14, and none of the 14 that it finds
are the same as any of the original 100.  I suspect the problem lies
with the xwdtopnm program, because xwud displays the original image
(saved to a file, of course, instead of the pipe) without color
distortion.  Pbmplus does not seem the way to go.

That being the case, has anyone succeeded with another approach?
Thanks in advance for any advice.  Since this sounds like something
that might be of general interest, I will summarize for the net.

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Michael Camann                          camann at dial.pick.uga.edu
Department of Entomology                camann at phoenix.cs.uga.edu
University of Georgia                   (706) 542-1388
Athens, GA 30602                        (706) 542-2276

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