[tofof]

The author uses CMC I:c (and somewhat incorrectly claims it's also called Delta E, which normally refers to one of the CIELAB metrics). Then he notes the asymmetry of that quasimetric, and a workaround -- averaging the C1,C2 and C2,C1 distances.

I wonder if perhaps he would be better served by simply using the actual "Delta E" metric, specifically ΔE*₀₀, which doesn't have this symmetry problem?

PS. Sexy interactive color matrix table. Small error in the text below -- values >=40 are highlighted, not >45.

[gka]

Author here, thanks for the feedback.

Well the only thing I know about DeltaE I know from Bruce Lindbloom's website, where he uses the terms interchangably. http://brucelindbloom.com/Eqn_DeltaE_CMC.html

But I'm happy to try out the CIELAB deltaE as well. I can already see another dropdown for comparing difference metrics coming up :)

Will fix the text error you found.

--edit: after reading again I see that he used DeltaE as a sort of broader category. worth fixing as well