this post was submitted on 03 Nov 2025
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A lot of formulaic stuff in media is bullshit. So much shit is done for no other reason than because it worked once before. Primary colors are one of them. Story structure; forget the actual name of it but every story doesn't need to be arranged in that particular order of start, build up, conflict, resolution (Pulp Fiction is a great example of something that ignores this rule). And more.
Primary colours are not made up, they are the approximate peak response frequencies of the cone cells in your retinas.
They kind of lie to us a bit in school when they teach us that to simplify the actual case. Other people have posted the actual curves.
L cones are most responsive to yellow-green, not red.
M cones peak in the green-cyan range.
S cones are most sensitive to violet rather than blue.
The whole RGB and CMYK mixing works observationally for us. But the biology behind it isn't as neat and as clean as the story they tell us when they're teaching us about the primary colors.