Our eyes are able to see 350.000 different colors. In order to classify in a simple way all these colors, it is necessary to find an objective chart in which the eye itself – with its defaults or imperfections which may vary from one person to another – is not involved.
There are three different ways of classifying colors:
A pure visual approach: Chevreul, Munsell, Ostwald color sytems;
A pure physical approach: RVB, CIE XYZ systems;
A physical approach, but corrected by psychometric data : CIELAB, CIELUV color systems.