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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).
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
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).
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. The luminous flux (or visible power) in a light source is defined by the photopic luminosity function. The following equation calculates the total luminous flux in a source ...
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Illustration of the CIE 1931 color space. This is a vectorized version of Image:CIExy1931.png by User:PAR. The spectral colours are embedded as a JPEG raster image with SVG blur applied to allow scaling to any size. From the description of Image:CIExy1931.png: The colors for this diagram were generated using the RGB color space in en:Adobe ...