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Related Experiment Videos

Rules for colour constancy.

J J McCann1

  • 1Vision Research Laboratory, Polaroid Corporation, Cambridge, MA 02139.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|April 1, 1992
PubMed
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Color constancy, the perception of stable object colors under varying illumination, is determined by the relative relationships of colors within the visual field, not absolute light signals.

Area of Science:

  • Visual perception
  • Color science
  • Neuroscience

Background:

  • Object colors appear constant despite changes in illumination.
  • Existing theories involve context recognition, retinal adaptation, and receptor-specific processing.
  • The role of relative versus absolute light signals in color constancy is debated.

Purpose of the Study:

  • To test the hypothesis that color constancy arises from the normalized relationship between all colors in the field of view.
  • To investigate whether relative quanta catches, rather than absolute reflectances, govern color perception.
  • To determine the influence of field of view on color constancy.

Main Methods:

  • Creation of 'colour tautomi' arrays with identical relative quanta catches but varying absolute reflectances.

Related Experiment Videos

  • Independent manipulation of reflectance and quanta catches for each receptor type.
  • Observation of color perception under different viewing conditions (full room vs. restricted field of view).

    • Main Results:

    • Arrays with identical relative quanta catches appeared different in a full field of view but identical in a restricted field of view.
    • Changes in absolute reflectances did not alter perceived color when relative quanta catches were preserved within a restricted field.
    • Introduction of new areas, like white, affected absolute color constancy.

    Conclusions:

    • Color constancy is primarily a field phenomenon dictated by the relative quanta catches within the visual field.
    • Absolute color constancy is influenced by both relative field quanta catches and absolute receptor quantum catches.
    • The normalized relationship between retinal cone signals is the key mechanism for color constancy.