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Colour Basics

Colour in X is based on a RGB Model: Where the colour is determined by red, green and blue values.

This is just like a TV set or computer monitor where an individual dot on the screen - a picture element or pixel) - has its colour controlled by RGB intensities.

Absence of all RGB intensities gives BLACK, FULL RGB intensities give WHITE, RED is absence of any Blue and green with different shades given by the red value. Shades of GREY are equal RGB intensities, PURPLE shades are mixtures of Red/Blue and NO green etc.
Tue May 24 16:52:56 BST 1994