In a message dated 98-12-09 01:34:43 EST, you write: > Oh I see...(I think). So if you have an image and you and half of > the mask has 1's you can only see half of the image (the half that has > 1's)? > Right. Image: dc.b %1010101010 dc.b %0101010101 Mask: dc.b %0000011111 dc.b %0000011111 Result: dc.b %0000001010 dc.b %0000010101 Daniel Imfeld