Yes, use png UNLESS you want it as a large turf. Like say 2 x 2 tiles, or it take up 4 total tiles, like a square I guess. Anyway, even if you copy the mask color from DM to paint, png doesn't call it the mask color, but actuaslly calls it a gray color, and treats it as such. BMP files will treat the mask as mask and it will have a colorless background. just be sure to stick the image as far to the top right corner and shrink the over all size of the image.



This gets treated as...



This when BMP. See how the gray isn't there, its invis like the mask.

PNG is better when making screen OR if the image you're using doesn't need to have any mask. make sure to make it as small as possible though. resize the paint...thing to fit the image in the top right corner. If that made any sense.