Exploring the reasons for platinum, blue and black

This is related to the sensitivity of the human eye to light. If what you see is "blue + black", it proves that the cone cells on your retina have higher color perception capabilities, which allows your eyes to actively eliminate part of the interference to observe the most realistic colors. And if what you see is "white + gold", then it proves that your eyes will bias the perception of color under low light conditions, resulting in a mixture of colors (such as red and green), so you will see in the picture gold.

Nanjing ophthalmologist:

There are individual differences in the "reading" of color

Zhang Zhonghong, deputy chief physician of the Department of Ophthalmology, Zhongda Hospital Affiliated to Southeast University in Nanjing, said that this The difference caused by the pictures is a very interesting phenomenon, and many of the reasons can only be inferred from the principles of visual imaging. First of all, it must be clear that differences in light and color saturation will have an impact on color perception. In addition to excluding these effects, it is possible for the same picture on the same monitor to be seen as different colors. .

“Our eyes perceive light and color mainly through the cones and rods on the retina. The cones are larger and the rods are smaller. They both Located in the macular area." Deputy Chief Physician Zhang Zhonghong explained that after the two types of cells receive light and color information, the visual pigments will be combined differently to present different colors for imaging on the retina. These "chemical reactions" will eventually form changes in electrical potential. This "electrical activity" is transmitted from the nervous system to the brain, and then the brain forms "psychological color" - that is, the color we see.

“The proportions of cones and rods are different, and their functions are different. The colors we initially 'see' will be different, and the subsequent reading process of the brain will also be different." Zhang Zhonghong The deputy chief physician said that in most cases, the colors seen by most people will be slightly different, but the difference is not big. When the color is not so saturated and is at the critical point, the "read" color appears completely different. Two factions are also possible.

As for the online conclusion that the "Platinum School" has poor night vision, Deputy Chief Physician Zhang Zhonghong said that this inference cannot be established. "First of all, we need to understand the working principles of the two visual cells." Deputy Chief Physician Zhang Zhonghong explained in detail that cone cells mainly work when the light is relatively strong and have the ability to perceive light and distinguish colors, while rod cells mainly work when the light is relatively strong. When working in dim light, you can only perceive light but cannot distinguish colors. Therefore, if this skirt is actually blue and black, then it is possible to say that the function of the cones on the retina of the "blue-black" party is better. But the converse conclusion is that the "Platinum School" has poor night vision. Because the rod cells that cannot distinguish colors work in the dark, errors in color discrimination can only be inferred to the cone cells and have nothing to do with the rod cells. Therefore, the debate between "blue-black" and "platinum" cannot be linked to night vision ability. . The following comes from the analysis conducted by photography professionals on the Zhihu website.

"After understanding the cause of this problem (visual color constancy), I conducted a simulation experiment. Here I will show the ideas and results of the experiment to help those who cannot understand the "opposite camp (Platinum Party/ People in the "Blue and Black Party" and "Neutral Camp (Platinum, Blue and Black, changing back and forth)" figure out how the other camp perceives colors. To answer the question first, if this skirt is judged only from the photo, it can be either platinum or platinum. It can be black and blue. It can even be blue-brown, blue-gold, etc. The reason why it is so controversial is that people think that no matter what the situation is, this photo can be taken. The only difference is the different lighting environment in their minds. The Platinum Party believes that the scene is backlit, and the bluish white color is just the shadow being dyed blue by the ambient light. The Blue and Black Party believes that the scene is filled with yellow light. First, create a model of the Platinum Clothes:

Under uniform white light. The result:

Use a large area of ??blue light to illuminate the back side to simulate cold diffuse light. The God's perspective is as follows:

Looking through the lens, there is blue-leaning light behind the lens:

Are the colors here the same as in the photos?

Then the experiment with the blue and black model:

This is the blue clothing model and the blue under full white lighting. Black clothes:

The picture on the right is the perspective of using warm light from above:

This is the result from the lens and comparison with the real thing:

Two completely different clothes, under different lighting conditions, can almost get the same photo.

In reality, this skirt may be blue and black, but in the photo. The white balance is not very good and is very yellowish. My experiment is not to simulate this failed photography, but to try to "visualize" the process of the human brain recognizing the color and light environment of this ambiguous photo.

Through this experiment, you may understand why there are such big differences around the world. The same two colors can be interpreted by the brain as white gold on the backlight, or blue under the influence of yellow light. Black, even blue and gold, blue and brown.

Understand a little bit of color knowledge and the rules of how people perceive colors in nature, and you will smile knowingly about this incident. As for the so-called "people who see platinum have bad rod cells", "the eyes will bias the perception of colors under low light conditions, resulting in a mixture of colors (such as red and green), so you will see gold in the picture ." and other similar medical conclusions, I am afraid we need to ask medical experts to speak more responsibly and demonstrate it rationally.

Attached is a photo color band value obtained by the RGB color selection system.

It can be clearly identified from the picture that the gold/black part is neither 0, 0, 0 pure black. , it is not a golden color that does not exist in the color system, but an earthy yellow; the blue/white part is also roughly a light blue. It can be seen that the reason for people's disagreement is not the inaccurate perception of color by the eyes itself, but the different thinking angles when people simulate the ambient light source to judge the color of clothes. Therefore, if you are worried about problems with your rod cells, you don’t need to worry anymore. No matter what color is judged, it has nothing to do with vision and nerves. Everything is the judgment effect of the brain.

The debate between platinum, gold, blue and black seems to be continuing. As for why some people can see various colors repeatedly, I will not go into details in this entry. For details, you can follow the original link or search for "Color Constancy" "Sex" entry.