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| Thanks for opening that discussion, great starting point! Would be a great enhancement to a class of tools (like historical-satellite) we've been building for the disaster-management and research communities (esp. archaeology, looting detection etc) It would be useful for such a utility/function to: 
 The mappings array could probably be used as-is in the maplibre/mapbox fragment shader - or the simpler contrast stretching params, opened a similar discussion here maplibre/maplibre-gl-js#6273 to allwo per-band definition of  Here is the scikit-image doc and histogram_matching.py implementation based simply on numpy  Also sharing interesting notes regarding color-spaces here mapbox/rio-hist#3 | 
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Sometime we images from different satellite imagery providers have different color histogram distribution. In order to have comparable images it can be useful to match histograms. Idea from @jo-chemla
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