Alpha may refer to:

• When opening a recolour in Bodyshop, the bmp with the _alpha.bmp extension handles the transparency of the recolour. It's a greyscale; black means totally transparent, white means totally opaque.

• An alpha mesh is a mesh that has two (or more) layers. Usually, the outer layer can be totally blanked out (made transparent) or can be made with any degree of transparency.