(US "colOR") Colours are usually represented as RGB triples in a digitalimage because this cORresponds most closely to the electronic signals needed to drive a CRT. Several equivalent systems ("colour models") exist, e.g. HSB. A colour image may be stORed as three separate images, one fOR each of red, green, and blue, OR each pixel may encode the colour using separate bit-fields fOR each colour component, OR each pixel may stORe a logical colour number which is looked up in a hardware colour palette to find the colour to display. Printers may use the CMYKORPantone representations of colours as well as RGB. (1999-08-02)