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Color and gloss constancy under diverse lighting environments.

Takuma Morimoto1,2,3, Arash Akbarinia1,4, Katherine Storrs1,5,6

  • 1Justus Liebig University Giessen, Giessen, Germany.

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|July 11, 2023
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Summary
This summary is machine-generated.

Human color and gloss perception struggles under varied lighting. While hue judgment is accurate, lightness, chroma, and gloss constancy are poor, especially with unusual illuminants, challenging our visual system.

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Area of Science:

  • Visual perception
  • Color science
  • Material property estimation

Background:

  • Human vision perceives object properties like color and gloss simultaneously.
  • Reflections (diffuse and specular) create complex surface variations.
  • Changing lighting conditions drastically alter perceived object appearance.

Purpose of the Study:

  • To measure the human ability to judge color and gloss concurrently.
  • To investigate performance across diverse object and illuminant properties.
  • To understand the challenges in perceiving intrinsic material properties.

Main Methods:

  • Participants adjusted reference object properties (hue, lightness, chroma, specular reflectance).
  • Comparison was made between a reference and test object under different lighting.
  • Image statistics and reflection contrast were used to analyze failures.

Main Results:

  • Hue matches were accurate, except under atypical illuminants.
  • Chroma and lightness constancy were generally poor, correlating with image statistics.
  • Gloss constancy was particularly poor, only partially explained by reflection contrast.
  • Participant deviations from constancy were highly consistent.

Conclusions:

  • Color and gloss constancy are robust in simple conditions but challenged by complex real-world lighting and shapes.
  • The visual system faces significant difficulties in judging intrinsic material properties under varied conditions.
  • Individual differences in constancy failures are minimal, suggesting systematic visual processing limitations.