I am still currently trying to get UnDelphiX to work with my game. I programmed an Isometric tiling engine with UnDelphiX and it worked fine, so I'll give it a try. I use bmp format for my graphics. And I use Toon Boom Studio 7.1 for NPC sprites cause it makes it easy to create animatios. Once the animationn is complete, I export the animation sequence to bitmap. I have tried black an fuschia, but it doesnt work. See the only time it works is if the outline of my chatacter has 1 color. Then transparancy is great. But I will try Gimp as you suggest. With Toon Boom Studio, my background is usually Fuschia.