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Colour expectations across illumination changes.

Hamed Karimipour1, Christoph Witzel1

  • 1School of Psychology, Southampton, United Kingdom.

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Summary
This summary is machine-generated.

Human expectations for naturalistic color shifts under changing light align with real-world conditions. Relational color constancy aids in reliably identifying surface colors, even in artificial lighting scenarios.

Keywords:
Colour constancyColour renderingHyperspectral imagesLightingNatural scenes

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Area of Science:

  • Vision science
  • Color perception
  • Psychophysics

Background:

  • Understanding human color expectations is crucial for color constancy research and applications in art and industry.
  • Previous studies suggest color adjustments align with naturalistic illuminant-induced shifts.

Purpose of the Study:

  • To investigate human expectations of naturalistic color changes under varying illuminations.
  • To test if participants judge naturalistic illuminant and reflectance spectra as more plausible than artificial ones.
  • To explore the role of relational color constancy in observer expectations.

Main Methods:

  • Reanalysis of asymmetric color match data from a prior study.
  • Three experiments using hyperspectral images of naturalistic scenes with manipulated illuminant and reflectance spectra.
  • Observer judgments on the plausibility of naturalistic versus artificial color renderings.

Main Results:

  • Observers selected naturalistic renderings above chance but only slightly more often than artificial ones when illuminant/reflectance were scene-wide.
  • Observers more reliably identified naturalistic reflectance when only one object's reflectance was manipulated.
  • Relational color constancy was found to contribute significantly to observer expectations.

Conclusions:

  • Relational color constancy and prior knowledge of surface color shifts aid in identifying surface colors under illumination changes.
  • Human observers can reliably recognize surface colors in naturalistic conditions due to these mechanisms.
  • Relational color constancy demonstrates effectiveness in many artificial conditions as well.