Notes

The image above gives us an idea of how color vision at the early stages of visual processing might look like. Indeed, superimposing the three subfigures to the right and to the bottom, we obtain the top-left subfigure. Thus, we can notice one channel indicating the red-green information, another the blue-yellow information and one channel describing the light variation information.

There are several studies suggesting that this represents an efficient way of encoding color information, thus explaining why the brain evolved and developed this technique.