What is the leafes texture, alpha or masked? It's looking more like maskmode to me. In both cases the usage of TGA won't help, because Texturefiltering and Mipmapping will make the contour ae to black (as long as the transparent parts are black, no matter if it's 32bit TGA or not). It is unfort. not possible to load a mask other than with the rgb color black for transparent parts (only exception is DXT3 an 5). If you don't have to load the tree model completely textured, then you may use the OptimizeAlpha example from the archives to fix this black border issue.