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color resources problem
- Subject: color resources problem
- From: Udo Grabowski <udo.grabowski(at)imk.fzk.de>
- Date: Fri, 25 Feb 2000 15:23:11 +0100
- Newsgroups: comp.lang.idl-pvwave
- Organization: Forschungszentrum Karlsruhe
- Xref: news.doit.wisc.edu comp.lang.idl-pvwave:18655
After struggling a while with X on an 8bit monitor and it's colormap on 5.3,
we decided to write our programs the elegant way as described in the IDL manual:
"If you wish to specify unique colors for your widgets, it is generally a good
idea to use a color name ("red" or "lightblue", for example) rather than
specifying an exact color match with a color string (such as "#b1b122222020").
If IDL is not able to allocate an exact color, the entire operation may fail.
Specifying a named color implies "closest color match," an operation that RARELY
We did it, and we found out that this technique almost ALWAYS FAILS ! The
most remarkable oddity is that we can specify "#0000FF" exactly and get
blue, but specifying "blue" fails for whatever reason, though this color
is exactly defined as "0 0 255 blue" in the X rgb.txt file ! We tried a couple
of more or less exotic colors, but most of them fail with a
'Warning: Cannot allocate colormap entry for "xxx"'. !d.n_colors is
around 160, and we even loaded a couple of color tables, but
nothing helps. Of course we did a 'device, decomposed=0', and we are
shure that we also set up correctly the resources with xrdb and triple
checked the code.
Is there anything we miss ? Some secret passage somewhere hidden in the
manuals ? Or is this just another bug ?
Dr. Udo Grabowski email: firstname.lastname@example.org
Institut f. Meteorologie und Klimaforschung II, Forschungszentrum Karslruhe
Postfach 3640, D-76021 Karlsruhe, Germany Tel: (+49) 7247 82-6026
http://www.fzk.de/imk/imk2/ame/grabowski/ Fax: " -6141