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CIE 1976 L*a*b* colour difference
CIELAB colour difference
difference between two colour stimuli, defined as the Euclidean distance between the points representing them in the CIE 1976 L*a*b* colour space and calculated as: 
Note 1 to entry: See also CIE 15
Note 2 to entry: See also ISO/CIE 11664-4
Note 3 to entry: This entry was numbered 845-03-57 in IEC 60050-845:1987.
Note 4 to entry: This entry was numbered 17-156 and 17-172 in CIE S 017:2011.