Corresponding chromaticities for different states of adaptation to complex visual fields

Area of Science:

• Color Science
• Visual Perception
• Photometry

Background:

• Human color vision is influenced by the illuminant.
• Chromatic adaptation explains how the visual system adjusts to different light sources.
• Understanding adaptation is crucial for accurate color reproduction and perception.

Purpose of the Study:

• To investigate the extent of chromatic adaptation when eyes are exposed to different illuminants simultaneously.
• To determine how illuminance levels and receptor types affect the completeness of adaptation.
• To evaluate the validity of the von Kries transformation model under varying conditions.

Main Methods:

• Observers adapted each eye independently to different illuminants or illuminances.
• Color matching was performed between stimuli viewed by each eye under binocular viewing conditions.
• Experiments involved a range of illuminants and illuminances, including D55.

Main Results:

• Chromatic adaptation was less complete at lower illuminances and for blue-sensitive receptors.
• A linear von Kries transformation using experimentally determined primaries closely predicted results, except at very low illuminances.
• Varying illuminance levels, even with identical chromaticities, altered chromatic adaptation.

Conclusions:

• Color adaptation is incomplete, particularly under low light and for specific receptor types.
• The von Kries model provides a good approximation but has limitations at low illuminances.
• Higher color purity is required for consistent color appearance at lower illuminance levels.