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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 25, Iss. 12 — Dec. 1, 2008
  • pp: 2908–2917

Investigations of suprathreshold color-difference tolerances with different visual scales and different perceptual correlates using CRT colors

Zhehong Wang and Haisong Xu  »View Author Affiliations


JOSA A, Vol. 25, Issue 12, pp. 2908-2917 (2008)
http://dx.doi.org/10.1364/JOSAA.25.002908


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Abstract

In order to investigate the performance of suprathreshold color-difference tolerances with different visual scales and different perceptual correlates, a psychophysical experiment was carried out by the method of constant stimuli using CRT colors. Five hue circles at three lightness ( L * = 30 , 50, and 70) and chroma ( C a b * = 10 , 20, and 30) levels were selected to ensure that the color-difference tolerances did not exceed the color gamut of the CRT display. Twelve color centers distributed evenly every 30° along each hue circle were assessed by a panel of eight observers, and the corresponding color-difference tolerances were obtained. The hue circle with L * = 50 and C a b * = 20 was assessed with three different visual scales ( Δ V = 3.06 , 5.92, and 8.87 CIELAB units), which ranged from small to large visual scales, while the remaining hue circles were observed only with the small visual scale. The lightness tolerances had no significant correlation with the hue angles, while chroma and hue tolerances showed considerable hue angle dependences. The color-difference tolerances were linearly proportional to the visual scales but with different slopes. The lightness tolerances with different lightness levels but the same chroma showed the crispening effect to some extent, while the chroma and hue tolerances decreased with the increment of the lightness. For the color-difference tolerances with different chroma levels but the same lightness, there was no correlation between the lightness tolerances and the chroma levels, while the chroma and hue tolerances were nearly linearly proportional to the chroma levels.

© 2008 Optical Society of America

OCIS Codes
(330.1690) Vision, color, and visual optics : Color
(330.1720) Vision, color, and visual optics : Color vision
(330.1730) Vision, color, and visual optics : Colorimetry

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: June 23, 2008
Revised Manuscript: September 10, 2008
Manuscript Accepted: September 21, 2008
Published: November 4, 2008

Virtual Issues
Vol. 4, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Zhehong Wang and Haisong Xu, "Investigations of suprathreshold color-difference tolerances with different visual scales and different perceptual correlates using CRT colors," J. Opt. Soc. Am. A 25, 2908-2917 (2008)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-25-12-2908


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