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Re: IDL Color Blues [message #9764 is a reply to message #9683]

Tue, 12 August 1997 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Alex Schuster wrote:
>
> Aviv Gladman wrote:
>
>> We used to have the colourmap swapping problem on our 24-bit Ultras, which
>> kind of surprised me as there is really no concept of colourmaps for a
>> 24-bit display. In DirectColor mode, IDL tries to grab all 16 million odd
>> colours into a private colourmap, resulting in the flashing. You can
>> probably solve you problem using the DEVICE, TRUECOLOR=24 . the DEVICE,
>> DECOMPOSED=0 or DEVICE, DECOMPOSED=1 commands can then be used to turn
>> on/off 8-bit colour mapping (in one mode, 24-bit colours are mapped to the
>> loaded 8-bit colour palette so TV and PLOTS use a 256 colour palette that
>> can be loaded via XLOADCT, in the other mode, 24-bit colours are as
>> expected, RGB settings, and images always seem to use an greyscale
>> palette in this mode). When swapping colourmaps in 8-bit emulation, you
>> have to redraw the window to get the colour change to have an effect
>> (since you aren't actually changing the colour palette, you're just
>> changing the RGB colour mappings).
>

You might try putting the following in your
/usr/openwin/lib/Xdefaults (or .Xdefaults) file:

Idl*colors: -10

This tells IDL to reserve 10 colors before grabbing color indices,
thereby sparing colors used by the system.

Dave
--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2200
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		IDL Color Blues By: wonko on Mon, 11 August 1997 00:00
		Re: IDL Color Blues By: Alex Schuster on Thu, 14 August 1997 00:00
		Re: IDL Color Blues By: David Foster on Tue, 12 August 1997 00:00
		Re: IDL Color Blues By: Alex Schuster on Tue, 12 August 1997 00:00
		Re: IDL Color Blues By: Aviv Gladman on Tue, 12 August 1997 00:00
		Re:IDL Color Blues By: Paul Crain on Fri, 15 August 1997 00:00

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