Color images

Sensation of color is determined by the light wavelengths contained in light. Approximate description of color exploits tri-stimuli model that assumes that all colors may be represented as mixtures of three primaries. The most commonly used primaries are red, green and blue. These primaries are directly used in cameras and displays. In printing, for color sample representation cyan, magenta and yellow are used as primaries.

RGB representation

Combinations of the three primary colors R (red) , G (green) and B (blue) can match unknown colors X. (There exist various definitions of primary colors R, G and B that differ slightly one from the other.)

Color light is mathematically described by triples (R,G,B)