CIE 1976 L*u*v* colour difference 
difference between 2 colour stimuli, defined as the Euclidean distance between the points representing them in the L*u*v* space and calculated as equation:
Equivalent term: "CIELUV colour difference"
See also CIE 15 Colorimetry
See also ISO 11664-5:2009(E)/CIE S 014-5/E:2009 Colorimetry - Part 5: CIE 1976 L*u*v* Colour Space and u', v' Uniform Chromaticity Scale Diagram