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Visualizing Visual Adaptation
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Rethinking Colour Constancy.

Alexander D Logvinenko1, Brian Funt2, Hamidreza Mirzaei2

  • 1Glasgow Caledonian University, Glasgow, United Kingdom.

Plos One
|September 11, 2015
PubMed
Summary
This summary is machine-generated.

Colour constancy is challenged by metamer mismatching, where object colors change under different lighting. Our study shows these concepts are mutually exclusive, suggesting color constancy may not exist as previously believed.

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Area of Science:

  • * Visual Perception and Color Science

Background:

  • * The long-held belief in object colour constancy, dating back to Helmholtz, posits that object colors remain stable under varying illuminations.
  • * Experimental deviations from colour constancy are typically considered minor.
  • * Metamer mismatching, where two objects with identical spectral reflectance under one light produce different spectral reflectances under another, poses a challenge to this notion.

Purpose of the Study:

  • * To re-evaluate the concept of colour constancy in light of the limitations imposed by metamer mismatching.
  • * To determine the extent to which metamer mismatching affects colour constancy.
  • * To propose an alternative framework for understanding object color perception under changing illumination.

Main Methods:

  • * Calculated the effect of metamer mismatching for 20 Munsell papers and 8 illuminant pairs from a prior study.
  • * Analyzed the relationship between metamer mismatching and observed deviations from colour constancy.
  • * Defined a concept of 'material colour' based on object/light pairs.

Main Results:

  • * Metamer mismatching's effect is extensive, rendering the notions of metamer mismatching and colour constancy mutually exclusive.
  • * Colour constancy leads to paradoxical phenomena, such as objects appearing identical under chromatic light but distinct under neutral light.
  • * Colour is demonstrated to be an attribute of an object/light pair, not an intrinsic property of an object.

Conclusions:

  • * The traditional concept of colour constancy, as an intrinsic object attribute, is fundamentally flawed due to metamer mismatching.
  • * Colour constancy, as currently understood, likely does not exist.
  • * Focusing on the alteration of object colours induced by illumination change and the concept of 'material colour' offers a more fruitful research direction.