Ask HN: Best ML/AI libraries for extracting dominant colors from images

If you do any sort of color extraction from images, what is your best tool to do so, preferably in the form of a plug-and-play library you can throw at an image file?

We've been playing with our own algorithms, but they leave something to be desired, and I wonder if we're trying to reinvent the wheel if this is a solved problem.

Thank you, HN.