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Everything about Relative luminance

Ratiometric definition of luminance

Relative luminance follows the photometric definition of luminance including spectral weighting for human vision, but while luminance is a measure of light in units such as, relative luminance values are normalized as 0.0 to 1.0, with 1.0 being a theoretical perfect reflector of 100% reference white. Like the photometric definition, it is related to the luminous flux density in a particular direction, which is radiant flux density weighted by the luminous efficiency function of the CIE Standard Observer. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Relative luminanceA 5-minute orientation
  2. Skim a recent paper: Development of a Low-Cost Luminance Imaging Device with Minimal Equipment Calibration Procedures for Absolute and Relative LuminanceInfluential work since 2022
  3. Pick up a classic book: The origin of ideasThe most-reprinted book on the subject
  4. Read the landmark paper: Sex, Beauty, and the Relative Luminance of Facial FeaturesCited 142 times
  5. Go sideways: GrayscaleA closely related topic
  6. Go sideways: Luma (video)A closely related topic

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