Re: RGB -> RGBA

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Kent Watsen (watsen++at++netcom.com)
Wed, 22 Mar 1995 08:35:06 -0800 (PST)

>
>
> 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 ?
>

  There are some packages which can handle this, but they are rather
expensive. I wrote some code which accepts two files, the first is
the source image and the second is the ALPHA intensity image, and
combinds them to form the needed RGBA image. I could make these
conversion routines available if interested.

Kent Watsen
watsen++at++netcom.com

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