> Someone did a really nice tutorial on this issue recently and posted the
> url to this list.  Of course I don't know where a searchable archive is
> so that does not help much does it?

The tutorial is at
http://www.gimp.org/~sjburges/color_to_alpha/color2alpha.html

Do note that my tutorial works best for non-photographic images, but you can
use it to get close with photographic ones and touch up what you need to
afterwards.

Its not in general an easy problem.  There's not really a great tool for it yet
in Gimp; this filter goes totally agressive and leaves no hint of the color to
be removed.

Happy GIMPing,

Seth Burgess
[EMAIL PROTECTED]

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