color names and fill colors

From: David B. Reusch <dbr_at_nyahnyahspammersnyahnyah>
Date: Fri, 26 May 2006 12:04:34 -0400

I seem to have run into a step change in the progression of gray colors
defined in lib/X11/rgb.txt. I would like to use a very light gray for
mpLandFillColor. "gray87" (rgb=222/222/222) is too dark but everything
lighter appears to just be white. for example, the next highest,
"gray88" (rgb=224/224/224) looks to be indistinguishable from white. I
don't think this is an on-screen rendering problem since going to X11 or
to PS produces the same result. (trying different PS viewers also had
the same result.) I've also tried different versions of ncl (a033 on OS
10.4 and a031 on Solaris). I think I've tried all tests available to me
(different output workstations, different versions of ncl, different PS
viewers, printing to make sure it's not the screen itself) so I'm left
wondering if there is something in ncl that could explain this
behavior? I wouldn't be surprised to reach a range of grays that
converged on white, that's to be expected, but what I'm seeing is a
*big* jump. I've also used the default gsdtol and gsltod colormaps in
the past w/o (obvious) problems, if that's any kind of clue.


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Received on Fri May 26 2006 - 10:04:34 MDT

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