[Endoperez]

The black background has to be (0,0,0) black. Screenshot from Dominions has colors that are almost pure black, but not quite, like (0,2,1). White would be (255,255,255), and as the difference is as small as it is, it is impossible to decipher the difference with human eye,

Do you happen to use Gimp, by the way? I hear Gimp has some scripting capability, and I might be able to put together a script that generates 128x128 unit picture with correct background and shadow.