Colour Matching of Isoluminant Samples and Backgrounds: A Dimming Effect

Sequential asymmetrical colour matching of forty Munsell samples simulated under illuminant C and one of eight test illuminants was carried out. The subjects matched the appearance of each sample under illuminant C with its appearance under the test illuminant. Samples and background (N7) were prese...

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Bibliographic Details
Published in:Perception (London) 2005-01, Vol.34 (8), p.927-932
Main Authors: Murray, Ian J, Kulikowski, Janus J, Stanikunas, Rytis, Vaitkevičius, Henrikas, Daugirdiene, Avsra
Format: Article
Language:English
Subjects:
Adaptation, Ocular
Biological and medical sciences
Color Perception - physiology
Color Perception Tests
Contrast Sensitivity - physiology
Fundamental and applied biological sciences. Psychology
Humans
Lighting
Perception
Photic Stimulation
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychophysics
Sensory Thresholds - physiology
Vision
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Summary:Sequential asymmetrical colour matching of forty Munsell samples simulated under illuminant C and one of eight test illuminants was carried out. The subjects matched the appearance of each sample under illuminant C with its appearance under the test illuminant. Samples and background (N7) were presented for 1 s under the test illuminant and were isoluminant with each other. Subjects adjusted hue, chroma, and value under illuminant C. The experiments distinguished two groups of subjects; some observers needed to reduce the luminance of the sample to make a match while others did not. This ‘dimming’ occurred when the matches were close to cardinal axes, especially the tritanopic confusion line. A model of luminance and cone-opponent mechanisms contributing to brightness can account for the dimming effect. Details of analysis in cone-opponent space (L-M, L+M-S, L+M) are presented in the companion paper (Stanikunas et al, 2005 Perception 34 this issue).
ISSN:0301-0066
1468-4233
DOI:10.1068/p5301