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Related Experiment Videos

Spectral-luminosity functions, scalar linearity, and chromatic adaptation

J Pokorny1, Q Jin, V C Smith

  • 1Visual Sciences Center, University of Chicago, Illinois 60637.

Journal of the Optical Society of America. A, Optics and Image Science
|June 1, 1993
PubMed
Summary

Chromatic adaptation significantly impacts spectral-luminosity measurements. High luminance levels cause variations in how we perceive light, primarily due to adaptation to the measurement stimuli.

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Area of Science:

  • Visual perception
  • Photometry
  • Color science

Background:

  • The luminosity function describes the average human eye's sensitivity to light.
  • Chromatic adaptation, the adjustment of visual sensitivity to light's spectral composition, can influence photometric measurements.

Purpose of the Study:

  • To investigate the influence of chromatic adaptation on the luminosity function across different luminance levels.
  • To determine how measurement stimuli affect spectral-sensitivity functions.

Main Methods:

  • Conducted three experiments: heterochromatic flicker photometry, heterochromatic modulation photometry, and flicker increment detection.
  • Measured spectral-sensitivity functions and photometric matches across a wide luminance range (1.6 to 5000 Td).
  • Analyzed data by fitting to cone fundamentals and examining ratios and weightings at different luminance levels.

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Main Results:

  • Spectral-sensitivity data showed deteriorated fits at high luminances, indicating chromatic adaptation effects.
  • Heterochromatic modulation photometry revealed luminance-dependent changes in red-green ratios at 605 nm, but not at 570 nm.
  • Flicker increment detection showed luminance-dependent increases in middle-wavelength-sensitive cone weighting on a 605-nm background.

Conclusions:

  • Luminance-dependent variations in spectral-luminosity functions, particularly those assessed by flicker techniques, are primarily driven by chromatic adaptation to the measurement stimuli.
  • Chromatic adaptation must be considered when interpreting photometric data, especially at higher luminance levels.