Talk:Photopic vision

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The 1931 CIE photopic luminosity function.[edit]

Drawing can be better, as fare I am consent.

Find my source: “Luminosity response curve” at

I am working on draft to a better drawing:

BoyeHenningLauritzen (talk) 17:39, 16 November 2007 (UTC)

575nm is so *not* red[edit]

Quote from page "The human eye uses three types of cones to sense light in three respective bands of color. The pigments of the cones have maximum absorption values at wavelengths of about 445 nm (blue), 535 nm (green), resp. 575 nm (red)."

575nm is so *not* red. it's barely in the yellow sprectrum, let alone pushing it's way through orange to get into red.

Sources: 23:18, 3 May 2007, IP:

You are absolutely right, but as primate trichromatic (3 colour) vision has developed from the dichromatic (2 colour) vision of most mammals, there has been little evolutionary time for the 3rd photopigment (chemical responsible for light absorption) to develop. It has resulted from the genetic duplication of one of the original photopigments, which has slightly mutated form the original, and is used for the red end of the spectrum; through what could be called very clever neural circuitry (ie. analysis by the nervous system, and brain). George-E 23:12, 24 May 2007 (UTC)

P.s. The page seems a little sparse to go into this detail at present, but somebody could eventually? George-E 23:14, 24 May 2007 (UTC)

Photopic Luminous Efficiency Function[edit]

This article is about biologic spectral response. But the actual data values are not included. Here they are: numeric graphic 1988 C.I.E. Photopic Luminous Efficiency Function
(The functions should be annotated with color names to make the information as accessible as possible to the general reader.) (The Luminosity function article has nice graphs and very nice color bar -- it would be good to copy all those into this article.) - 14:34, 20 May 2007 (UTC)

Human cone response[edit]

Please provide the complete un-normalized response curves of the three types of humans color receptors, and show how this adds up to (or differs from) the Luminosity function.- 02:17, 25 May 2007 (UTC)