What is "Metamerism" - Definition & Explanation

Variations in color perceived under different light, surrounding colors, or by the observer's sense of color. http://en.wikipedia.org/wiki/Metamerism_(color)
A marked change in the colour of an object with a change in the spectral composition of the light by which it is viewed.
Metamerism can be judged only with reference to the changes occurring in other objects in the fields of view as the illumination is changed.
A metamerism occurs when the color standard and the submit do not match under all lighting conditions. This means that a solid color fabric when viewed under two different lights in a commercial light box, will appear to cast two different colors. The correct technical definition for metamerism is a conditional match that is, two or more samples match for one observer under one light source, but not under a different light source for that same observer.

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Some more terms:

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