.BLP's and .TGA's

[Asuhrie]

I've recently developed an interest in doing some graphical changes to the ingame textures for the various interface screens.

The major problem I've had is that when converting .TGA's to .BLPs, the colors tend to bleed and the resulting image is imperfect. I've ran across a few threads stating that you can use .tga files instead of .BLPs, but anytime I do this, WoW fails to load my .TGA file.

Does anyone know a solution to this? Or maybe a technique I can use to minimize bleeding?