usual way to measure colour difference is just distance in a perceptually uniform space – YUV/HSV are terrible for this but houdini can convert to L\*a\*b* which is better, it’s what the “delta-E” difference in monitor calibration uses it sorta works just doing the obvious thing with Unrefine like this but idk how you’d better take into account the position of each key… it’s kinda like camera smoothing where you want to smooth the path it takes but also the speed along that path, so maybe CHOPs-type filtering could work if you don’t mind ending up with regularly spaced keys 🔑
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