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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8151–8166

Correlation between color quality metric predictions and visual appreciation of light sources

Kevin Smet, Wouter R. Ryckaert, Michael R. Pointer, Geert Deconinck, and Peter Hanselaer  »View Author Affiliations


Optics Express, Vol. 19, Issue 9, pp. 8151-8166 (2011)
http://dx.doi.org/10.1364/OE.19.008151


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Abstract

Over the past years there has been increasing evidence that the CIE color rendering index Ra fails to correspond to the perceived color quality of many light sources, especially some Light-Emitting-Diodes. Several proposals to update, complement or even replace the CIE Ra have therefore been made. The performance of thirteen color quality metrics was evaluated by calculating the average correlation of the metric predictions with the visual scaling of the perceived color quality obtained in several psychophysical studies. Two aspects of perceived color quality were investigated, appreciation (preference or attractiveness) and naturalness. The memory color quality metric (Sa) of Smet et al. was found to correlate highly with perceived appreciation (r = 0.88). It was found to be statistically better (p<0.0001) at it than all other metrics. The CIE Ra performed the worst. A metric that combines the gamut area index (GAI) and the CIE Ra using an arithmetic mean correlated highly with the perceived naturalness of a light source (r = 0.85). It was found to be statistically better at predicting naturalness than all other metrics (p<0.0001). A negative correlation was found, between the capabilities of a light source’s ability to predict appreciation and naturalness, indicating that a complete description of the color quality of a light source probably requires more than one metric.

© 2011 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(330.5020) Vision, color, and visual optics : Perception psychology
(330.5510) Vision, color, and visual optics : Psychophysics
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: December 20, 2010
Manuscript Accepted: April 10, 2011
Published: April 14, 2011

Virtual Issues
Vol. 6, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Kevin Smet, Wouter R. Ryckaert, Michael R. Pointer, Geert Deconinck, and Peter Hanselaer, "Correlation between color quality metric predictions and visual appreciation of light sources," Opt. Express 19, 8151-8166 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-9-8151


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