Oh my, i was on that exact page on wikipedia and the RGB stuff never came up :S
I always thought that because paint is all one colour in the tin, if it was matchable on an image in any light / reflection on the car would closly represent its real life counterpart. Guess i was wrong.
In anycase, thanks for the input guys.
PS: my card is an 256 ati x800 GTO and i havent mucked about with any colour modes or anything.