Re: transparent GIF pixels

[Craig Markwardt <craigmnet(at)cow.physics.wisc.edu>]

davidf@dfanning.com (David Fanning) writes:

> 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?

I think he said he wanted to *avoid* writing and then reading back.
Other than that let's keep agreeing.

Craig


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Craig B. Markwardt, Ph.D.         EMAIL:    craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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