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  4. How color difference formulas depend on reference pairs in the underlying constant stimuli experiment
 
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2015
Journal Article
Title

How color difference formulas depend on reference pairs in the underlying constant stimuli experiment

Abstract
For calculating color differences, the CIEDE2000 and CIE94 equations are widely used and recommended. These equations were derived more than a decade ago, based for a large part on the RIT-Dupont set of visual data. This data was collected from a series of psychophysical tests that use the method of constant stimuli. In this method, observers need to compare the color difference within a sample pair to that between a reference pair. In the current investigation, we show that the color difference equation significantly changes if reference pairs are chosen in the underlying visual experiments that differ from what was used when creating the RIT-Dupont dataset. The investigation is done using metallic paint samples representing two color centers, red and yellow-green. We show that the reproducibility differs for three different reference pairs, and that for modeling the visual data for the yellow-green color center, extra model terms are required as compared to the CIEDE2000 equation. Our results suggest that observers differ in their ability to mentally convert a color difference recognized in a sample pair into an equivalent color difference along the color difference direction represented by the reference pair. We also find that in these test the tolerance to lightness differences is widened by a factor of 1.3 to 1.6, and that for the red color center the tolerance ellipsoid is rotated by 30° as compared to the CIEDE2000 equation. The latter observations are possibly due to the metallic texture in the samples used for the current experiment.
Author(s)
Kirchner, Eric
AkzoNobel
Dekker, Niels
AkzoNobel
Lucassen, Marcel
Lucassen Colour Research
Njo, Lan
AkzoNobel
Lans, Ivo van der
AkzoNobel
Koeckhoven, Pim
AkzoNobel
Urban, Philipp  
Fraunhofer-Institut für Graphische Datenverarbeitung IGD  
Huertas, Rafael
Univ. Granada
Journal
Journal of the Optical Society of America. A, Optics, image science, and vision  
DOI
10.1364/JOSAA.32.002373
Language
English
Fraunhofer-Institut für Graphische Datenverarbeitung IGD  
Keyword(s)
  • colorimetry

  • experiments

  • color perception

  • perception psychology

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