Is it true that every color between red and green, can be made using monochromatic light. I think is should be true according to the visible spectrum. I may only need to increase or decrease the intensity of the color.
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2$\begingroup$ This is a close to being a repost of physics.stackexchange.com/q/830709/174766. $\endgroup$– Vincent ThackerCommented Oct 12 at 19:33
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5$\begingroup$ This question is similar to: Why can colours like RGB $(168, 151, 80)$ be seen by humans?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. $\endgroup$– The PhotonCommented Oct 12 at 19:34
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1$\begingroup$ Color is simply not a concept in physics. Physics deals with frequency and wavelength, not redness and greenness. How light is perceived by the human visual system as having color is biology and psychology, not physics. $\endgroup$– GhosterCommented Oct 12 at 20:54
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1$\begingroup$ "Every color between red and green" in what space? The picture in your question represents the one-dimensional space of monochromatic colors. It has a red and it has a green, and every color between them (as well as every other color in that particular space) can be produced with a single frequency of light. $\endgroup$– Solomon SlowCommented Oct 12 at 20:55
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1$\begingroup$ You may benefit from reading Poynton's Color FAQ. It's a bit dated, but most of the info is still relevant because modern display technology was designed to replace CRT technology without major color distortions. $\endgroup$– PM 2RingCommented Oct 12 at 21:23
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In industrial application, we assume three color-detecting cell model that approximate human response. Then approximate the observed colors of the single frequency by linear combination of the three. This is called CIE 1931 color space. In here, if you pick just two monochromatic color as basis, by linear combination, you can just express a line in the color space. By combination of three, we can approximate the color space, but not fully. Many displaying industries wants to express as much color space their combination cover, so, there are many standards out there.
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$\begingroup$ By the way, I noticed physics.stackexchange.com/questions/830709/… had more detailed answer there. If you are interested, I recommend to read the answer of it. $\endgroup$– K.R.ParkCommented Oct 12 at 21:22