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Almost complete colour constancy achieved with full-field adaptation.

I J Murray1, A Daugirdiene, H Vaitkevicius

  • 1Faculty of Life Sciences, Moffat Building, University of Manchester, P.O. Box 88, Manchester M60 1QD, UK. i.j.murray@umist.ac.uk

Vision Research
|May 3, 2006
PubMed
Summary
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This study on color appearance reveals that longer adaptation periods, especially with larger backgrounds, significantly alter perceived colors. These color shifts are linked to background perception changes and modeled using cone opponent responses.

Area of Science:

  • Color Science
  • Visual Perception
  • Photometry

Background:

  • Investigating color appearance changes under different illuminants is crucial for understanding visual perception.
  • Simulated Munsell samples were used to assess color shifts under controlled lighting conditions.

Purpose of the Study:

  • To quantify color appearance changes in simulated Munsell samples under varying illuminants and adaptation fields.
  • To model the timing of these color shifts using cone opponent response mechanisms.

Main Methods:

  • A successive asymmetric color-matching task was employed.
  • Measurements utilized two Planckian illuminants (A and S) and two field sizes (20° and 120°).
  • Adaptation periods ranged from 1 to 60 seconds, and color shifts were analyzed using a modified Brunswik ratio (BR).

Related Experiment Videos

Main Results:

  • Higher Brunswik ratios (BR) correlated with longer adaptation times, particularly with the larger 120° field.
  • Observed color appearance changes were attributed to subtle shifts in the perceived background color.
  • The timing of color shifts aligns with models based on cone opponent responses, indicating near-complete von Kries adaptation.

Conclusions:

  • Adaptation period and background field size significantly influence color appearance.
  • The study provides a quantitative model for color shifts based on visual adaptation mechanisms.
  • Findings contribute to a deeper understanding of human color perception and visual adaptation processes.