How do they see the world of color blind?

If we already make the algorithm for distributing attention in the image , then we need to do it in the mind, which means that it becomes vitally important to determine the “color strength”.

Color perception

The sensation of color depends on the signal entering the brain from S, M and L cones. At the same time, some colors defined by a person feel several types of cones at once, and precisely because of this, some colors appear brighter than others, the same in tone and saturation.


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It is interesting, but what would the colors look like if the power of their perception was the same with saturation? Answering this question, I wrote a program that illustrates the relationship between color and perception. And here are the results of her work:

Color target: original , post-processing .
Another color target: original , post-processing .

But the images shown show the result only for full color vision. I wonder how people look at the world of color blind?

Color blindness

And color blind people are different: color blindness occurs mainly due to the lack of cones of a certain type. If there are not enough cones of two types, the colors do not differ at all, the world looks monochromatic, as in black and white photography. But in the case of a deficiency of cones of one of the types S, M or L, a situation of indistinguishability of some colors arises.

Let's try to model, based on the data of the sensitivity of cones, the perception of color blind!

Honestly, these models are not calibrated. Ideally, color blind should not feel the significant difference between the original and the simulation result. But in order to imagine how - curious is it? :)

In the pictures - images after normalizing the power of perception of color. Targets and screenshots are mine, and photos are taken from sitesfrom here , from here and from here .

Originals:

Deficiency of L cones (indistinguishability of red):

Deficiency of M cones (indistinguishable green):

Lack of S cones (blue and violet not visible):

In my opinion, people with indistinguishable blue shades in everyday life have the easiest way. Much harder for non-discriminating red. Traffic lights, traffic signs, warnings are often invisible.

PS

Having received several requests to show the program after writing a post on vision modeling , I decided to make a simple web service of the type “fill in the picture> get the result”. In this regard, he began to rewrite the program that generates the dynamics. I accept the proposals as it should look.