Krrios File Format Reference

Colors
Index Files
Anim.mul
Anim.idx
AnimData.mul
Art.mul
ArtIdx.mul
Fonts.mul
GumpArt.mul
GumpIdx.mul
Hues.mul
Light.mul
LightIdx.mul
Map<n>.mul
MultiMap.rle
Multi.mul
Multi.idx
Palette.mul
RadarCol.mul
SJIS2Uni.mul
SkillGrp.mul
Skills.mul
Skills.idx
Sound.mul
SoundIdx.mul
Speech.mul
StaIdx<n>.mul
Statics<n>.mul
TexIdx.mul
TexMaps.mul
TileData.mul
UniFont[n].mul
VerData.mul

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UO Colors

UO's graphics are all 16-bit 555 color:

Data:

short color;

Color Bit Masks:

F E D C B A 9 8 7 6 5 4 3 2 1 0
Red Green Blue

Bit 15 is normally used for transparency, but doesn't appear to be so in UO.