Yellow is formed by R:255 G:255 B:0, but the frequency of yellow light is different from that of red and green light.

深圳小花

Yellow is formed by R:255 G:255 B:0, but the frequency of yellow light is different from that of red and green light. [Copy link]

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Yellow is formed by R:255 G:255 B:0, but the frequency of yellow light is different from that of red and green light. Can anyone explain this principle? Thank you.

maychang

Yes, the frequency of yellow light is different from that of red light and green light. So the yellow light formed by R:255 G:255 B:0 you see is not the same as the yellow light in the spectroscope (such as the double yellow line of sodium), it is just that your nerves produce the feeling of "yellow".

If you use a spectroscope to look at the light of R:255 G:255 B:0, you can see the difference.

maychang

Don't think that the light of R:255 G:255 B:0 is monochromatic. No, R:255 G:255 B:0 is just a mixture of two frequencies of light, which gives people a yellow feeling.

maychang

The double yellow line of sodium in the spectrum is approximately monochromatic light (approximately because there are more detailed structures) with a certain frequency. R:255 G:255 B:0 is a mixture of two frequencies.

深圳小花

maychang posted on 2021-4-3 12:06 Yes, the frequency of yellow light is different from that of red light and green light. So the yellow light formed by R:255 G:255 B:0 you see is different from the yellow light in the spectroscope...

Thank you very much. Could you provide me with some information about this? Thank you.

chunyang

The "yellow light" mixed with red and green is just an illusion of human beings, it is "equivalent yellow". The reason for this is that the cone cells that sense color in the human eye are composed of three types: red, green and blue, but each type is not only able to sense monochromatic light, but has a certain sensitivity range. For yellow light, the cone cells that sense red and green will respond, so stimulating the cone cells with red and green mixed light will cause the human eye to have an illusion that it is seeing yellow light. It can also be inferred that other animals with different color sensitivity ranges of cone cells from humans will feel completely different from humans when watching the same picture presented by the real world and human color displays.