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Re: gamma correction [message #31327 is a reply to message #31261]

Wed, 03 July 2002 15:05

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

"Craig Markwardt" <craigmnet@cow.physics.wisc.edu> wrote in message
news:onu1nncb6p.fsf@cow.physics.wisc.edu...
>
> David Fanning <david@dfanning.com> writes:
>
>> Craig Markwardt (craigmnet@cow.physics.wisc.edu) writes:
>>
>>> Beautiful rose, thank you very much! IDL versions checked from
>>> 5.2 to 5.4.
>>
>> That's what I thought. And that's why Dick's first solution
>> won't work for you. Those babies are not going through
>> the color tables. :-)
>
> Okay, now I guess I understand. Actually you fooled me, I thought the
> beautiful flower was the right answer. :-)
>
> Let me say that I think that the Windows/Mac approach, while it may be
> neato/keen, is just plain wrong. It's documented nowhere! The system
> documentation for DEVICE, DECOMPOSED=1 mentions nothing about such a
> transformation. There should be a documented flag to enable this, and
> then it should work consistently across platforms, darnit!

Having confirmed with Craig that this is the same behaviour on the X
device under True_Color=24 or Direct_Color=24 (which is different from
Windows), all I can say is "humph".

I think it's really a useful feature. If you can fiddle with a grayscale
image by just changing the colortable, why not have the same thing with
an RGB image? That's how it made sense to me when I discovered this
feature/bug, anyway.

Thanks for clearing this up, guys!

Cheers,
--
-Dick

Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392

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[Message index]

		gamma correction By: carine castillon on Wed, 26 June 2002 01:14
		Re: gamma correction By: Dick Jackson on Wed, 03 July 2002 15:05
		Re: gamma correction By: Craig Markwardt on Fri, 28 June 2002 16:46
		Re: gamma correction By: David Fanning on Fri, 28 June 2002 15:31
		Re: gamma correction By: Craig Markwardt on Fri, 28 June 2002 15:04
		Re: gamma correction By: David Fanning on Fri, 28 June 2002 14:32

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