colour
(US "color") Colours are usually represented as
{RGB} triples in a {digital} {image} 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 {CMYK} or {Pantone} representations of
colours as well as RGB.
(1999-08-02)