RGB -> RGBA

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abrend++at++idt.unit.no
Wed, 22 Mar 1995 09:39:55 +0100

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I want to reuse some old textures I have, but I want to add an alpha
bitplane. Is there any simple program where you can extract a
selected part of an image and set all pixels outside to have alpha
value, say eq. 50% ? For example: I want to make a tree (much like in
the Performer town) and I have a RGB texture of a tree, how to I set
the pixels outside the three to have an alpha value that makes them
invisible.

Any ideas ?

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