How to determine the transparency color of a bitmap

Posted by Sky Sanders on Stack Overflow See other posts from Stack Overflow or by Sky Sanders
Published on 2010-04-03T16:58:05Z Indexed on 2010/04/03 17:03 UTC
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I know you can programmatically determine the tranparency color of a .gif

Is there a way to do the same for a Bitmap?

Right now, I am doing this heuristically by sampling around the outer edge but of course this is not 100% reliable.

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