I've looked at the various threads in this subforum and none of them really addressed my specific issue. My main goal is using blp as texture replacements (in the Interface folder), not in an addon, so I do need to use the blp format and can't use tga.
My main problem is a loss in quality when I convert png into blp. See attachment. My main method of conversion is BLP2PNG, but I've also tried using this Photoshop Plug-in, and also saving as a 32-bit tga and converting it to blp. All of these methods produce the same amount of quality loss, even when the source is 32-bit.
Is this just a problem native the the blp format, or is there some other conversion method I can use?