Skinning with GIMP
https://forum.il2sturmovik.com/topic/13 ... with-gimp/
For alpha channel:
https://forum.il2sturmovik.com/topic/15 ... -skinners/
https://forum.il2sturmovik.com/topic/15 ... ent-337537
https://forum.il2sturmovik.com/topic/54 ... ent=843008
Photoshop CS2
http://www.deadbored.net/qt3/DDS%20Plugin/