That is correct that sometimes colors can be trapped in one palette. The metric is Euclidean distance using shortest path method. It's obvious in bird image, where there is a division between colors in right and left side of the image. Euclidean distanceI have got results in the bottom by changing the lightness formula, from intensity to relative luminance and using the look up table when extracting the edge weights to calculate the distance to the palette pairs. Euclidean distanceCMCEuclidean CMC CIE2000
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