Source : Free On-Line Dictionary of Computing

colour model
     
         Any system for representing {colours} as {ordered
        sets} of numbers.  The most common colour models are {RGB},
        {CMYK}, and {HSB}.  There are several others, e.g. {CMY}, and
        the "Lab" system(?).
     
        See also: {Pantone}.
     
        (1999-10-21)