the difference between two colour stimuli defined as the Euclidean distance between the points representing them in the L* a* b* space and calculated as equation
NOTE – The CIE 1976 a, b hue-difference may be calculated as follows:
CIE 1976 a, b hue-difference: ΔH*ab = [(ΔE*ab)2 − (ΔL*)2 − (ΔC*ab)2]1/2
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