Coelacanth
2022 年 10 月 13 日
这个跟人类对颜色的识别（ Color Perception ）有关系，
"Principle of univariance: cones give the same kind of response, in different amounts, to different wavelengths. Output of cone is obtained by summing over wavelengths.
Responses measured in a variety of ways"
这个也是为什么三原色的原理，即（ Grassmann's Law)
1st Law: Any color stimulus can be matched exactly by a combination of three primary lights.
● The match is independent of intensity
■ Basis of many color description systems
2nd Law: adding another light to both of these stimuli changes both in the same way
也正是因此，发展出了不同的颜色系统（ RGB ，YMCK ，HSI 这些）
英语里有个词叫“metamerism"，基本就是说的你这个现象
”In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.“
白话一点，主要原因是因为人类眼球的视觉细胞对特定波长的光的敏感度不同，我们观察到的颜色其实是大脑处理过的信号，是一个输出值（蓝色），但是一个输出值可以对应不同的输入值（不同色度的”蓝色“）。
计算机视觉或者神经科学的教材里面应该都会讲这个。