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In CIELAB, the difference between two colors is described as the distance between their coordinates. Learn how ΔE*ab is calculated, what ΔL*, Δa*, and Δb* mean, and why modern formulas like ΔE00 are needed.
CIELAB and CIELUV were introduced in 1976 as approximately uniform color spaces. Learn the structure of CIELAB with L*, a*, b*, the conversion from XYZ, and the use of polar coordinates C*ab and hab.
Tristimulus values XYZ are translated in practice to x,y,Y coordinates. However, the x,y diagram is not perceptually uniform, as MacAdam demonstrated with his famous ellipses - an important motivation for CIELAB.
CIELAB is one of the most important systems in colorimetry. Discover the origins of the system, the role of the CIE, and the basis of the XYZ tristimulus values from which CIELAB is derived.