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  2. Luminous efficiency function - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficiency_function

    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 ...

  3. Scotopic vision - Wikipedia

    en.wikipedia.org/wiki/Scotopic_vision

    The CIE 1951 scotopic luminosity function. The horizontal axis is wavelength in nm. The normal human observer's relative wavelength sensitivity will not change due to background illumination under scotopic vision. The wavelength sensitivity is determined by the rhodopsin photopigment.

  4. Photopic vision - Wikipedia

    en.wikipedia.org/wiki/Photopic_vision

    The 1931 CIE photopic luminosity function.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).

  5. Luminous efficiency function - en.wikipedia.org

    en.wikipedia.org/.../mobile-html/Luminosity_function

    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.

  6. CIE 1931 color space - Wikipedia

    en.wikipedia.org/wiki/CIE_1931_color_space

    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).

  7. International Commission on Illumination - Wikipedia

    en.wikipedia.org/wiki/International_Commission...

    The CIE 1931 colour space chromaticity diagram with wavelengths in nanometers.The colors depicted depend on the color space of the device on which the image is viewed.. The International Commission on Illumination (usually abbreviated CIE for its French name Commission internationale de l'éclairage) is the international authority on light, illumination, colour, and colour spaces.

  8. Luminous flux - Wikipedia

    en.wikipedia.org/wiki/Luminous_flux

    The luminous flux accounts for the sensitivity of the eye by weighting the power at each wavelength with the luminosity function, which represents the eye's response to different wavelengths. The luminous flux is a weighted sum of the power at all wavelengths in the visible band. Light outside the visible band does not contribute.

  9. Photometry (optics) - Wikipedia

    en.wikipedia.org/wiki/Photometry_(optics)

    Photopic (daytime-adapted, black curve) and scotopic (darkness-adapted, green curve) luminosity functions. The photopic includes the CIE 1931 standard (solid), the Judd-Vos 1978 modified data (dashed), and the Sharpe, Stockman, Jagla & Jägle 2005 data (dotted). The horizontal axis is wavelength in nm. Photometry is a branch of optics that ...