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Related Experiment Videos

Lightness, brightness, and brightness contrast: 1. Illuminance variation

L E Arend1, B Spehar

  • 1Eye Research Institute, Boston, Massachusetts.

Perception & Psychophysics
|October 1, 1993
PubMed
Summary

Perceptual judgments of reflectance are ambiguous in simple patterns. Complex patterns improve apparent reflectance matching, but different matching criteria (brightness, lightness, contrast) yield distinct results.

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Area of Science:

  • Visual perception
  • Color science
  • Psychophysics

Background:

  • Disk-and-annulus patterns present ambiguous luminance changes, conflating reflectance and illuminance.
  • Complex patterns can disambiguate apparent reflectance perception.
  • Previous research has not fully explored how different perceptual matching criteria affect reflectance estimation.

Purpose of the Study:

  • To investigate how different perceptual matching criteria (brightness, lightness, brightness contrast) influence the estimation of surface reflectance.
  • To determine if complex surrounds can lead to illumination-invariant reflectance matches.
  • To quantify discrepancies between perceived lightness and actual reflectance.

Main Methods:

  • Subjects performed matches on test and standard patches presented with varying surrounds in complex patterns.

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  • Matching criteria included apparent brightness, apparent lightness (reflectance), and brightness contrast.
  • Stimuli varied in luminance and were presented under different illuminations.

    • Main Results:

    • Brightness contrast matches were achieved when the test and standard patch/surround luminance ratios were equal.
    • Lightness matches were illumination-invariant but introduced a small, constant error, particularly for decrements (approx. 1.5 Munsell value steps).
    • Brightness matches showed significant covariation with illuminance levels.

    Conclusions:

    • Perceptual matching of reflectance is criterion-dependent, with brightness contrast offering the most accurate estimation.
    • While lightness matches reduce illuminance dependency, they are not perfect reflectance matches due to surround effects.
    • Brightness perception is strongly influenced by illuminance, limiting its use for reflectance estimation.