Wait what? Are you saying the parts that are alpha are black or white? They are clear/transparent. In photoshop make sure you have a transparent background and just erase the parts that you want alphaed.
The background is white and I'm trying to figure out how to make it black so that it won't show up in the game. I would erase it all but it's kind of a complex image and would take a long time to do.
To make a background transparent all you have to do is either make a new layer that is transparent and move it to be the background, or make a new image with a transparent background and copy the texture into that. Making the background black won't alpha it.
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