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The red sensitivity curve for eyes (properly the cones are called Long, Medium and Short rather than Red, Green and Blue) also doesn't have a left hump. This is
by OscarCunningham 5y ago
The red sensitivity curve for eyes (properly the cones are called Long, Medium and Short rather than Red, Green and Blue) also doesn't have a left hump. This is a misunderstanding originating from the fact that the X in CIE XYZ does have a left hump. But the XYZ functions are not intended to correspond to cone sensitivities.
https://en.wikipedia.org/wiki/CIE_1931_color_space https://en.wikipedia.org/wiki/CIE_1931_color_space
- Miiko 5y agoAccording to what I could google, red sensitivity curve does have a left bump: https://www.researchgate.net/figure/Normalized-spectral-sensitivity-of-retinal-rod-and-cone-cells_fig7_265155524 https://www.researchgate.net/figure/Normalized-spectral-sens... So this is not a misunderstanding, but the real reason why magenta (red+blue) is perceived similar to violet (shorter wavelength than blue) by human eye.
- dahart 5y agoWhat you’re finding is the CIE “color matching functions”, which is closely related but not the same thing as the raw physical response of the cones. Here is a paper describing the difference, and more current research than what you found: https://hal.archives-ouvertes.fr/hal-01565649/document https://hal.archives-ouvertes.fr/hal-01565649/document Look specifically at page 2, and the linear relationship between the color matching functions (where red has a left-bump), and the “fundamental sensitivity” plot, which is attempting to find raw physiological cone response to different wavelengths, rather than what the observer perceives.