Yeah, what bloodsong said. :) Since it's a trans map you can get away with a gif or something, but if you're lazy like me and use jpgs, make sure your compression isn't too high or you'll lose the black as he said. I think my problem was caused by not changing my transparency on my layers (I think i exported my image into a jpg at 95% opacity instead of 100% opacity, because last night I kept noticing the bar wasn't going to 100% in PSP until I moved it a second time, and now I remember to watch that closely). So long as it's true black, and your highlights are black (and trans settings are set) you should be ok.