You see colour using three different kinds of cones in our eyes, and these cones can be either red, blue, or green. So where does yellow come in? Green consists of yellow and blue – but how would you only see yellow and not the blue that would make it green?
In: Biology
It works like the pixels in a monitor. Light colors are ‘additive’, meaning that to get white you mix all three primary colors together in equal and full intensity, and to get black you turn them all off. So to get secondary, tertiary, etc colors you would turn down the primary color that you don’t want to see.
In the visible spectrum of light, yellow is bookended by green and red. So to get yellow you mix the two colors that overlap with yellow (green and red), but not the color that doesn’t overlap with yellow (blue).
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