Im trying to put some logos in a car i made in 3dsmax, to do this, i need the logo image and the "bump" image or the alpha channel (is it the same?), that is the black and white mask that tells the app where it should be transparent. I got the logos images, how can i make the bump mask in PS. So i can save two files, the logo and the mask. I think its not too hard but i dont know the right way to do it. Thanks.