photoshop
PS: layer transparecy to alpha channel

ps_layer_trans_to_alphaThis Photoshop tutorial shows you a simple way to make an alpha channel from a layer with transparency and save a .tga file. This is useful if your graphic will be used on a system that does not handle premultiplied alpha channels. Otherwise your color could fade to gray or black in the partially transparent areas giving your graphic an unwanted halo.

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