Originally posted by Galakmech
I know GIMP and I do not like it !
Are you sure that it does not exist another graphic editor (With or without *.TGA file format support ...) ?
Well, for most of KotOR's needs, it does need to support .tga files... make absolute sure of that...
Also, in addition to RedHawke's statements, keep in mind that this game and it's elements were created professionally (on most parts at least ;) ) for mass distribution, and when they were skinning, I guarantee they weren't using a 'freebie' program. To make any adjustments, you're going to need comparable tools to accomplish this. Programs like "MS Paint" etc. just won't hack it....
Though you don't like GIMP, it's still one of the best optioned/outfitted graphic editors available with most every tool you'll need for skinning. Not to mention, free... Big plus on that point...
Maybe perhaps try
http://www.downloads.com) (Cnet). They have tons of software, be it Freeware or Shareware, and it's divided into easy to search Categories. Most have reviews as well to get an idea of what earlier 'customers' had to deal with. Just keep in mind the following options:
1) .tga compatibility
2) Alpha Channels
3) Layers capable (though not required, highly recommended)
Hope that helps! :)