After downscaling a image to 8bit - 256 colours with IrFanView the quality is mostly lost! 
So its a great trick to open this image afterwards in Gimp and copy over it the old version 
which is then also indexed and allows to edit the palette (windows-dockabledialogues-palette) especially 
when goaling at applying the zero index to a certain other colour for masking import in UnrealEditor. 


P.s.: Find the best UT skinning 
tutorial in the web on ModDB.com - Kaal979! 