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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.

visible spectrum

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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.

CIE 1931 color space. Wikipedia

K.R.Park
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