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Re: 24 bit colors in IDL [message #13560 is a reply to message #13280]

Wed, 18 November 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Nigel Wade (nmw@ion.le.ac.uk) writes:

> Why do you want to blame SGI?
>
> If IDL asks for a DirectColor visual and gets what's wrong
> with that?

Geez, Nigel. Bad day? You must be the systems
administrator for a bunch of SGIs. :-)

My apologies. IDL does in fact look for a DirectColor
visual first. The problem with a DirectColor visual is
that it is not writeable. That is to say, you can't load
a color table. Thus, the *only* way you can express
a yellow color in a DirectColor visual is to specify
its color triple (usually as a 24-bit integer).
Similarly, the only way you can get a color image
is to use a 24-bit image. I suppose this visual is
looked for first because it is the "purest" form of
24-bit color.

The real problem with SGIs is that those guys tend
to use color correctly, but they are the only ones
to do so. If you get brought up on a machine that
is confused, then you tend to think the SGI is at
fault. :-)

Cheers,

David

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[Message index]

		24 bit colors in IDL By: Richard Penrose on Tue, 03 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf7203 on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: philip aldis on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 12 November 1998 00:00
		Re: 24 bit colors in IDL By: Richard Penrose on Wed, 11 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Thu, 19 November 1998 00:00

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