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The CIE 1924 photopic V(λ) luminosity function, [cie 3] which is included in the CIE 1931 color-matching functions as the y (λ) function, has long been acknowledged to underestimate the contribution of the blue end of the spectrum to perceived luminance. There have been numerous attempts to improve the standard function, to make it more ...
A comparison between a typical normalized M cone's spectral sensitivity and the CIE 1931 luminosity function for a standard observer in photopic vision. In the CIE 1931 model, Y is the luminance, Z is quasi-equal to blue (of CIE RGB), and X is a mix of the three CIE RGB curves chosen to be nonnegative (see § Definition of the CIE XYZ color space).
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There are two luminous efficiency functions in common use. For everyday light levels, the photopic luminosity function best approximates the response of the human eye. For low light levels, the response of the human eye changes, and the scotopic curve applies. The photopic curve is the CIE standard curve used in the CIE 1931 color space.
However, the overall luminosity function (which in fact is a weighted sum of these three curves) is subjective, since it involves asking a test person whether two light sources have the same brightness, even if they are in completely different colors. Along the same lines, the relative magnitudes of the X, Y, and Z curves are arbitrarily chosen ...
The 1931 CIE photopic luminosity function. The horizontal axis is wavelength in nm. The horizontal axis is wavelength in nm. Photopic vision is the vision of the eye under well-lit conditions ( luminance levels from 10 to 10 8 cd/m 2 ).
set terminal svg font "Bitstream Vera Sans,12" size 600, 400 set output "CIE_1951_scotopic_luminosity_function.svg" set xrange [380: 700] set yrange [0: 1] set xtics axis nomirror set ytics axis nomirror set key off set border 3 plot "scvle_1.txt" using 1: 2 \ with line linetype rgbcolor "blue" linewidth 2
English: Photopic luminosity function for the human eye in the infrared after Sliney (1976), based on CIE luminous efficacy function to 770 nm, extrapolated curve of Walraven and Leebeck (1963) based on Goodeve (1936), Pinegin (1945), Griffin, Hubbard and Wald (1947), Lau and Leo (1948), and Lewis (1955); corroborated by Sliney (1976).