Re: 24 bit color depth confuses my color table

[Reimar Bauer <r.bauer(at)fz-juelich.de>]

Daniel Luebbert wrote:
> 
> Hi,
> 
> I recently switched from IDL on Windows to IDL on Linux,
> and have some problems with my color tables.
> It seems that IDL cannot really cope with 24 bit color depth,
> at least not in a way that I would understand.
> So I followed the tips on David Fanning's web page, said
> "device,decomposed=0",
> tried all kinds of pseudo/true/direct color with all kinds of depths
> (8/16/24), but never got a satisfying result.
> I always get only 64 colors, and the color table seems completely chaotic (no smooth transition from blue via green to red...
> but arbitrary jumps in color from one color index to the next).
> 
> Can anybody tell me the secret for using color on 24-bit Linux displays?
> thanks,
> Daniel


Dear Daniel,

I posted at 8th of May the same question and Carsten shows me 
Liam's trick.

If you like to read the whole requests please look
at:

http://groups.google.com/groups?q=special+linux%2Fidl+problem+group%3Acomp.lang.idl-pvwave&hl=en&safe=off&meta=site%3Dgroups


"Liam E. Gumley" wrote:
> 
> Carsten Dominik wrote:
> >
> > >>>>> "RB" == Reimar Bauer <r.bauer@fz-juelich.de> writes:
> >
> > RB> Reimar Bauer wrote:
> > >>
> > >> Hi,
> > >>
> > >> I hope someone on this group know this problem and is able to help.
> > >>
> > >> On one of my linux system I got always a monochrome color output
> > >> (grey scale) by idl. All other applications do have colors.
> > >>
> > >> I have three identical machines ( I believe ) and only one of them
> > >> has this failure.
> >
> > This works for me, I got it from this group, but unfortunately I
> > forgot who the original author was.  Put the following text in a
> > startup file, like .idlrc and set the environment IDL_STARTUP variable
> > to point to that file:
> >
> > setenv IDL_STARTUP ~/.idlrc
> >
> > if !version.os_family eq 'unix' then device, true_color=24
> >   window, /free, /pixmap, colors=-10
> >   wdelete, !d.window
> >   device, decomposed=0, retain=2
> >   device, get_visual_depth=depth
> >   print, 'Display depth: ', depth
> >   print, 'Color table size: ', !d.table_size
> 
> The startup file shown is the one I use routinely on all my IDL
> platforms. If you want to use 8-bit display mode on a UNIX box, the
> first line becomes
> 
> if !version.os_family eq 'unix' then device, pseudo_color=8



-- 
Reimar Bauer 

Institut fuer Stratosphaerische Chemie (ICG-1)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg1/
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