conversion quality to blp.

Hello, currently i use war 3 viewer to do all my file conversions from tga, bmp, jpeg, etc to blp. However alot of times i notice that when i convert back to blp the quality of the blp image seems to be poor compared to other file formats. Is there anything you can do to enhance blp format?? I create my own skins from scratch because i am a modeller too, could this be where my problem is?, what im saying is there some thing you have to do specially when creating your own skins from scratch to maintain good quality conversions?

any help would be appreciated, alreadyused

The skin just gets a little blurred when changed, best to work on skins at 512x512 to avoid crappiness when converting and also for quality.