Alpha Texture is a black n white image that tells the engine what parts of the texture should/shouldn't be visible, invisible, or transparent.
Some file formats, like tga and dds, include the alpha texture into the file. You can use photoshop or paint shop pro (not sure) to edit it.
In photoshop, u go to the channels tab and create a new channel. If the file already has a transparent data, it would be a channel in the tab besides the default of rgb, red, green, blue
In the channel, u just take a brush and paint black or white colors on it. Trying to paint a color on it wouldn't do much.
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