I have a specific question concerning Stracraft sprites and shadowing/transparency effects. Everybody known the Alpha channel blending as a greyscale channel for shadow effects. From Stracraft game, the reserved colour to perform the blending is the blue (RGB: 35/35/255) Here the shadow sprite applied for a flamer unit: Ok, why not! Now, if we look at a sprite showing a flam frame, several none natural colour areas are represented. Thus, blue (one ton), cyan and green tons are used to perform the shadow blending. My question is what blending parameters are used?