Abstract
Colour is an integral part of our daily life and impacts on many decisions that we make. There have been several attempts by colour scientists and artists to specify colour, but no specific language evolved to describe it. The Commission Internationale de l’Eclairage (CIE) standardized light sources/illuminants and defined the standard observer response to colour which resulted in specifying colour numerically. It specified colour in terms of unreal primaries, XYZ, referred to as tristimulus values, which are further converted to calculate chromaticity coordinates – x y z, providing additional information about colour. Describing colour in terms of tristimulus values was itself a significant achievement, but had its limitations as well, mainly it was a non-uniform system. To overcome its limitations, the CIE transformed the system into a more uniform one and specifi ed colour in terms of L*, a*, b*, Cab* and hab, which formed the basis for most colorimetric calculations and helped colorists in handling colour applications.
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