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Mathematically structured color identification system developed by International Commission on Illumination (Commission Internationale de l’Eclairage, CIE). The system is based on the fact that there are three types of conical shaped light perception cells in human eye and those cells are sensitive to blue, green and red lights. Taking this fact in to account, each color is expressed in terms of three variables; L, a and b. Because it takes the light and the observer into account together with the object, CIE Lab color system gives more sensitive and reproducible results compared to the other color identification systems. See Also Color identification systems