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缩小颜色范围，将缩小后的范围，采用另一种index来mapping。
Other ways to encode a color image
Many other possible models may be used to represent the colors that make up an image. We could, for instance, use an indexed palette where we'd only need a single byte to represent each pixel instead of the 3 needed when using the RGB model. In such a model we could use a 2D matrix instead of a 3D matrix to represent our color, this would save on memory but yield fewer color options.
假如按此方法来将true color降为256color，会不会成为一个压缩方案？
本文链接：https://cs.pynote.net/ag/image/202206061/
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