"But really, since we’re talking about “dominant color”, and “color” is defined with reference to human vision, what we likely care about is the color “clusters

"But really, since we’re talking about “dominant color”, and “color” is defined with reference to human vision, what we likely care about is the color “clusters” apparent to a human observer. Which means we should work in a color model which accurately represents features relevant to human vision." That was my interpretation. The colour I'm interested in is the difference between two colours, delta E (dE) somewhere in the dE there is a rule-set that will do what I'm describing. cf http://zschuessler.github.io/DeltaE/learn/ http://zschuessler.github.io/DeltaE/learn/