- 追加された行はこの色です。
- 削除された行はこの色です。
- ColorQuantization/Octree へ行く。
- Color quantization using octrees
-- http://www.leptonica.org/papers/colorquant.pdf
- A Simple Method for Color Quantization: Octree Quantization
-- https://link.springer.com/chapter/10.1007/978-3-642-83492-9_20
- Octree Color Quantization
-- https://www.cubic.org/docs/octree.htm
- https://www.codeproject.com/Articles/109133/Octree-Color-Palette