alpha map controls the transparency of the bitmap
you can add an alpha map in photoshop by going into an alpha channel, in paintshop pro, it's add an alpha mask (i find photoshop easier to use but if you don't quite have the money for photoshop, i suggest you wait till adobe releases the online free version of photoshop, or you get gimp from gimp.org) of course i think in level bitmaps, the alpha distinguishes the difference between the detail maps for the ground, and controls reflectivity for structures, i'm not too sure tho (might wanna ask conscars or dane they can give you a more complete answer)
omg jahrain sexified that tree!
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