If you want to use it specifically as a normal image the only way you can do this is by using Read/WritePixel to individually correct the pixels where the image overlaps the background. I believe a function was made to do just that, but you'll have to hunt for it.
The only other option is to texture an object like a quad or similar using the TGA file.
The only other option is to texture an object like a quad or similar using the TGA file.