Looked a bit to my image2palette tool. Dear god is it a mess. Biggest issue - you NEED to tweak some thresholds to get best results, otherwise it might become meh. Consequently, using it fully-automatically is not quite possible, so i keep wondering about use-flow. For now i made a template for it that just makes a simple HTML table displaying original image and output palette, but code needs a lot of refactoring, i wrote it structuring "as needed" and mostly tried to get it working.

Also i'm not sure if I should support both HSV and CIE-LCh models, since univerally HSV yields bad results and CIE yields amazing results.

Here's some examples:
Screenshot-2017-10-29 Screensho…
Screenshot-2017-10-29 Screensho…
Screenshot-2017-10-29 Screensho…
Screenshot-2017-10-29 Screensho…
Screenshot-2017-10-29 Screensho…