Changing the texture in a MDL file (NPC, Enemy, Animated Object etc) info

[Madison Lastrega]

ok real easy problem that I know someone can give the answer to:) Map pieces and thier textures. do map pieces have to be in 256 color or can I convert them to 16 bit like enemies and NPC's, 'cause 256 is impossble to edit corectly:) thanks:)