Add possibility to save palette image

[benstadin]

It would be great if it was possible to save the an image using the palette of the clustered colors. Something like the first image here:
https://making.lyst.com/2014/02/22/color-detection/

Regards
Ben

[jariz]

Although cool, I'm not sure if this is in scope with the idea of the library. It's supposed to give you a list of colors, not generate images.