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Re: color table trouble [message #14887 is a reply to message #14877]

Fri, 02 April 1999 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Well, I'm full of ideas today... :-)

I wrote just a moment ago:

> But here is the real kicker reason for me: if I
> *care* about displaying my 24-bit images correctly
> (and color decomposition really only makes sense
> if I have 24-bit images, it seems to me) then--as
> I posted last week--I HAVE to set the DECOMPOSED
> keyword anyway:
>
> Device, Decomposed=1
> TV, image24
>
> If I don't do this, then I run the risk that my
> image will not be displayed properly, since with
> color decomposition off, ALL values, even those in
> 24-bit image values, are run through the color table.

Even this is not the whole story, because--of course--
the DECOMPOSED keyword is not an allowed keyword for
any graphics device EXCEPT X, Win, and Mac. So if I
want to write code that *always* works in *every*
environment (and who among us doesn't?) then I have
to wrap EVERY single TV command with something like
this:

CASE StrUpCase(!D.Name) OF
'WIN' : Device, Decomposed=1
'MAC' : Device, Decomposed=1
'X' : Device, Decomposed=1
ELSE:
ENDCASE
TV, image24, TRUE=1

Even at $100/hour I find it hard to type that much code
each time I want to display an image. :-(

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: color table trouble By: davidf on Fri, 02 April 1999 00:00
		Re: color table trouble By: Phil Aldis on Fri, 02 April 1999 00:00
		Re: color table trouble By: davidf on Fri, 02 April 1999 00:00
		Re: color table trouble By: davidf on Fri, 02 April 1999 00:00
		Re: color table trouble By: davidf on Fri, 02 April 1999 00:00
		Re: color table trouble By: davidf on Fri, 02 April 1999 00:00

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