Median-Cut Color Quantization, 제한된 색상에 대한 index 최적화
제한된 색의 최적화된 index를 구하는 방법
https://github.com/search?utf8=%E2%9C%93&q=median-cut+js&type=
이 링크에 js 모듈들 있음.
https://www.npmjs.com/package/rgbquant
- http://collaboration.cmc.ec.gc.ca/science/rpn/biblio/ddj/Website/articles/DDJ/1994/9409/9409e/9409e.htm + https://en.wikipedia.org/wiki/Color_quantization