Results 251 to 260 of about 2,702,303 (299)

Threshold color differences compared to supra-threshold color differences

Color Research & Application, 2000
Threshold color difference ellipses, as represented by the MacAdam ellipses have been compared to unit contours implicit in the CIE94 color difference formula, found to represent small supra-threshold color differences well, both in the CIE chromaticity diagram as well as the a*, b* diagram.
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Ratio Comparisons of Color Differences

Journal of the Optical Society of America, 1964
A group of 14 observers made ratio comparisons among a number of color differences consisting of Munsell color samples. The same color differences had been judged previously in another experiment by the method of paired comparisons. The results of the two experiments were found to be equivalent, indicating that both methods of judgment—the ratio method
Y, SUGIYAMA, H, WRIGHT
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Color Difference Thresholds in Dentistry

Journal of Esthetic and Restorative Dentistry, 2015
AbstractPurposeThe aim of this prospective multicenter study was to determine 50:50% perceptibility threshold (PT) and 50:50% acceptability threshold (AT) of dental ceramic under simulated clinical settings.Materials and MethodsThe spectral radiance of 63 monochromatic ceramic specimens was determined using a non‐contact spectroradiometer.
Paravina RD, Ghinea R, Herrera LJ, Bona AD, Igiel C, Linninger, Mercedes, Sakai M, Takahashi H, Tashkandi E, Perez Mdel M   +9 more
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Color naming and large color differences

Annual Meeting Optical Society of America, 1988
Color perception is categorical. Although many words for describing colors have been invented and used, there are only eleven basic color terms that are unambiguously employed to describe more than a million discriminably different colors. The 424 samples of the OSA Uniform Color Scales set are intended to sample 3-D subjective color space uniformly. A
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Automatic Calculation of Color Differences

Journal of the Optical Society of America, 1953
Punched-card operated computing machines have been used to translate from C.I.E. space to the equal visual stimulus space of Adams. Differences in terms of Judd units are calculated by the machines as are the original colorimetric integrations. These methods have been used to process several thousand routine reductions of spectrophotometric data and ...
A, OPLER, R W, MEIKLE, M J, CHARLESWORTH
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Evaluation of small suprathreshold color differences under different background colors

Chinese Optics Letters, 2014
A psychophysical experiment under constant stimuli is conducted on a CRT display to measure the visual suprathreshold color differences for five color centers recommended by CIE under the same five background colors. The performances of four CIELAB-based, three CIECAM02-based, and two OSA-UCS-based formulas are tested.
Zhehong Wang Zhehong Wang, Haisong Xu Haisong Xu   +1 more
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Paired Comparisons of Color Differences

Journal of the Optical Society of America, 1963
A group of 11 observers judged total color differences between a number of pairs of Munsell colors. The analysis of the judgments made for each observer and the group was carried out by three statistical methods, the Scheffe method, the Morrissey–Gulliksen matrix method and the modified Thurstone–Mosteller method. The three methods give essentially the
Y, SUGIYANA, H, WRIGHT
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Testing CIELAB-based color-difference formulae using large color differences

Optical Review, 2001
Three advanced CIELAB-based color-difference formulae, CMC, CIE94, and CIEDE2000, together with the basic CIELAB equation, were tested using large color-difference visual data (maximum average size was 12 CIELAB ΔE units) produced in this study. The color-difference comparison experiment was carried out at CIE Gray and Blue centers by a panel of 6 ...
Haisong Xu, Hirohisa Yaguchi, Satoshi Shioiri   +2 more
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Color Preferences Differ with Variations in Color Perception

Trends in Cognitive Sciences, 2015
A recent study demonstrates that color preferences of red-green dichromats differ systematically from color preferences of typical trichromatic observers. These differences can be partially explained by variations in cone-opponent mechanisms of dichromatic and trichromatic observers, but they may also be explained from an ecological perspective.
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Small and moderate color differences. IV. Color‐difference‐perceptibility ellipses in surface‐color space

Color Research & Application, 1983
AbstractModerate (0.5–1.5 CIELAB units) color differences in surface colors were scaled visually to obtain color‐dif‐ference‐perceptibility ellipses. The ellipse orientations appeared to be independent of the size of the color differences over the range indicated, and were consistent with literature results obtained with visual colorimeters.
Danny C. Rich, Fred W. Billmeyer
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