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Re:Vibrant.js: Extract prominent colors from an image by hDeraj on Tuesday May 26, 2015 @10:21PM (#9608965)
I just started a similar project a couple weeks ago. After getting the prominent colors, recoloring the original image makes a pretty neat effect.

http://www.jaredharkins.com/posts/palette.html

Re:Vibrant.js: Extract prominent colors from an image by blu_jay on Tuesday May 26, 2015 @10:33PM (#9608995)
I tackled the same problem. In fact, I utilized the same strategy you did. It is essentially the same, but allows for the user to input a gif and receive a reconstructed gif using only its "palette."

https://github.com/salkj/palette