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Would you consider purple a warm blue or a cool red? (lemmy.ml)

submitted 4 months ago by [email protected] to c/[email protected]

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[–] [email protected] 33 points 4 months ago (18 children)

Yes.

Purple is not a single color. Maybe a spectrum analysis could answer this for a given instance of purple, but that's not my area of knowledge.

[–] [email protected] 26 points 4 months ago* (last edited 4 months ago) (13 children)

Specifically, purple is not a wavelength, unlike red(s) at ~700nm and blue(s) at ~400nm.

Purple is what human eyes see when the blue and red cones are both stimulated by their respective colours of light.

[–] CerealKiller01 1 points 4 months ago (1 children)

So what would be the color created by a wavelength of 550nm?

[–] feedum_sneedson 4 points 4 months ago (1 children)

Green or something

[–] CerealKiller01 1 points 4 months ago (1 children)

Ohhh, I think I get it.

Purple is what you get when you force the visible light spectrum into a wheel, so there'll be something that "connects" blue with red?

If so, is the reason we perceive green as a different color than purple is because we have receptors for that specific wavelength, otherwise both colors would affect our red and blue color receptors similarly?

[–] feedum_sneedson 3 points 4 months ago* (last edited 4 months ago) (1 children)

Essentially, yes. Although violet is a colour, and that does correspond to a wavelength of light. I'm not really sure where violet ends and purple begins.