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Define Alpha Channel Color

Apr 20, 2012, 16:49
Post: #1
Define Alpha Channel Color
There seems to be tons of threads on how to make a transparent image, but I haven't been able to fine one to do one specific thing.

How do I set the alpha channel to be black? I want to have a black background on a png file, but I need the black to be transparent to things behind it on a webpage.
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