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   hermlon (hermlon@yuustan.space)'s status on Wednesday, 04-Dec-2024 08:50:41 JST hermlon

   Today I got the chance to ask our computer graphics professor a question that I asked myself quite some time ago: what the fuck is the color pink?
   
   Like, the color right before infrared is red, the color right before ultraviolet is violet. And every other color is some wavelength between those two colors. EXCEPT FOR PINK!?
   
   On a hue color wheel pink is between red and violet, so it's wavelength has to be somewhere around there, right??
   
   Well, turns out pink is the color humans perceive when red and violet are mixed (duh), meaning the red and blue cones are stimulated. Since both cones respond to wavelengths on the opposite ends of the visible spectrum, there is no monochromatic wavelength that would trigger both, hence there is no wavelength that looks pink.
   
   That's also the reason pink does not appear in a rainbow, because there white sunlight light, a mixture of (almost, hi Astro-fedi) all monochromatic wavelengths, is refracted based on wavelength, so no mixed colors occur in it.

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     djsumdog (djsumdog@djsumdog.com)'s status on Wednesday, 04-Dec-2024 13:33:24 JST djsumdog

     in reply to

     • sjolsen (Home Ultimate edition / Girl Inside®)
     makes me think of that recent rainbow video:
     
     https://odysee.com/@veritasium:f/you%E2%80%99re-probably-wrong-about-rainbows:2
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     sjolsen (Home Ultimate edition / Girl Inside®) (sjolsen@eepy.moe)'s status on Wednesday, 04-Dec-2024 13:33:29 JST sjolsen (Home Ultimate edition / Girl Inside®)

     in reply to

     @hermlon@yuustan.space And every other color is some wavelength between those two colors. EXCEPT FOR PINK!?you've got the right idea except for this part: almost all colors are non-spectral; pink isn't special in that regard. only the curved boundary ("spectral locus") of the chromaticity diagram corresponds to monochromatic light.
     
     (also there absolutely are wavelengths that stimulate all three types of cone cells; they're all fairly broadband and for this reason it isn't really correct to call them "red" or "blue" cones)

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     hermlon (hermlon@yuustan.space)'s status on Sunday, 15-Dec-2024 07:32:57 JST hermlon

     in reply to

     second mind blow: due to the curved, convex shape of the visible light perception, it is impossible to find three light sources that when addictively mixed together will be able to represent every visible color. Mixtures between the colors will always form a triangle between the three colors in the above graph, and there is no triangle that covers the whole space with its vertices corresponding to a color that actually exists.
     
     So there's no way to build a perfect display, at least not by using only three colors.

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