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Re: transparent GIF pixels [message #21153 is a reply to message #21142]

Thu, 10 August 2000 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Craig Markwardt (craigmnet@cow.physics.wisc.edu) writes:

> David, I think he's talking specifically about GIF transparent pixels.
> I understand that you can reserve one GIF color to be transparent, so
> to speak. Any pixels with that color are not rendered, so any
> background graphics can show through. This can be especially useful
> in web programming. I don't think he's actually trying to render it
> on the screen himself.

I'm not so sure. But I admit "I would like to make them transparent
while the image is in memory." could be open to interpretation.
I thought he wanted to see transparent pixels in IDL. Why else would
he be saving and reading them back?

> Unfortunately, the answer to the question appears to be that there is
> no way to assign transparent GIF pixels in IDL. There are no options
> to WRITE_GIF that would satisfy this requirement.

Craig, we found something today you and I agree on 100%! It's going
to be a good day, I can feel it. :-)

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/
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[Message index]

		Re: transparent GIF pixels By: Craig Markwardt on Thu, 10 August 2000 00:00
		Re: transparent GIF pixels By: Kenneth Mankoff on Thu, 10 August 2000 00:00
		Re: transparent GIF pixels By: Craig Markwardt on Thu, 10 August 2000 00:00
		Re: transparent GIF pixels By: davidf on Thu, 10 August 2000 00:00
		Re: transparent GIF pixels By: Craig Markwardt on Thu, 10 August 2000 00:00
		Re: transparent GIF pixels By: davidf on Thu, 10 August 2000 00:00

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