Comment on Why is #FFFFFF white, but mixing red green and blue paint is black?

• no_circumlocution@lemmy.world ⁨1⁩ ⁨week⁩ ago

  On a spectrum of visible light, yellow has a wavelength perfectly between red and green. Therefore, combining red and green, the average wavelength is the same as the wavelength of yellow.

  For reference: Image

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  • Nibodhika@lemmy.world ⁨1⁩ ⁨week⁩ ago

    One curious thing if you understand this is to think on purple. Purple is blue+red, but like you pointed out 2 colors should give you the average wavelength, which in the case of blue+,red should be green. So why the hell do we see purple as something different? Well, that’s because humans have 3 sensors for colors, roughly corresponding to Red, Green and Blue, triggering both Blue and Red without triggering green at the same time gets interpreted differently than green, even though it shouldn’t. Which means that purple is not a color, but rather a mind trick your brain plays on you.

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    • no_circumlocution@lemmy.world ⁨6⁩ ⁨days⁩ ago

      Yes, but violet light does exist in nature as higher frequency light than blue light. Violet is only a mental oddity when mixing additive primaries.

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  • modus@lemmy.world ⁨1⁩ ⁨week⁩ ago

    That makes sense. Thank you. I think the rules between additive and subtractive mixed together in my head and confused me.

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  • Mikina@programming.dev ⁨1⁩ ⁨week⁩ ago

    I’ve been wondering - how do you make brown? Don’t really see it on the spectrum.

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    • anton@lemmy.blahaj.zone ⁨1⁩ ⁨week⁩ ago

      Dark orange, it’s only brown when contrasted with something brighter.
      There is a technology connection video that goes into more details.

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    • fallaciousBasis@lemmy.world ⁨1⁩ ⁨week⁩ ago

      About 2 parts red to one part green.

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• HatchetHaro@pawb.social ⁨1⁩ ⁨week⁩ ago

  red light + green light = yellow light

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