Re: [Algorithms] Alpha Channel

[Stephen J B. <sj...@li...>]

On Sat, 26 Aug 2000, Pai-Hung Chen wrote:

> I want to use billboard in my program but cannot find a good way to create
> 32-bit bitmap with alpha channel of appropriate values.  Basically I want to
> create a bitmap of tree with leaves in various green colors (with alpha =
> 255) and all non-green colors transparent (alpha = 0) so that I can use it
> as the texture for my billboarded trees.  It would be nice if I can specify
> a non-green color C and make the alpha of all the pixels of color C in the
> bitmap to 0.  Is there any program capable of doing that with 32-bit bitmap
> with alpha channel?  This may be off-topic and you could send your advise to
> me off-line.
 
Use GLUT

Steve Baker                      (817)619-2657 (Vox/Vox-Mail)
L3Com/Link Simulation & Training (817)619-2466 (Fax)
Work: sj...@li...           http://www.link.com
Home: sjb...@ai...       http://web2.airmail.net/sjbaker1