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    $\begingroup$ This is a close to being a repost of physics.stackexchange.com/q/830709/174766. $\endgroup$ Commented Oct 12, 2024 at 19:33
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    $\begingroup$ 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. $\endgroup$ Commented Oct 12, 2024 at 19:34
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    $\begingroup$ 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. $\endgroup$ Commented Oct 12, 2024 at 20:54
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    $\begingroup$ "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. $\endgroup$ Commented Oct 12, 2024 at 20:55
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    $\begingroup$ 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. $\endgroup$ Commented Oct 12, 2024 at 21:23