I used Gimp to edit a jersey dds. In Gimp i added new logo and changed colors perfect. I apply layer mask and then save the file. But when i save it, it messes stuff up. Kinda smears and twist some pixel colors. I can still add to game and play but the quality looks bad. Not sure if someone has had this problem.
Found a way to work around it. I just saved to .tga format then converted it to .dds using DXTBmp and loss no quality.