Color Difference Data Research Articles

Suprathreshold color-difference ellipsoids for surface colors

The RIT-DuPont visual color-difference data [Color Res. Appl. 16, 297–316 (1991)] have been used to estimate contours of equal color-differences (ellipsoids) at 19 color centers, in CIELAB and x, y, Y/100 color spaces. The ellipsoid fits are better in the CIELAB space than in x, y, Y/100, since the design of the RIT-DuPont experiment emphasized directional balance in CIELAB. The ellipsoids estimated are hardly tilted with respect to L* or Y/100, and they appear to be in overall good agreement with those reported for object colors in recent publications. From the characteristics and accuracy of the RIT-DuPont experiment, the current ellipsoids can be considered highly reliable and representative of color discrimination under the observational conditions employed, these closely following the “reference conditions” recently suggested by the CIE for industrial color-difference evaluation [Color Res. Appl. 20, 399–403 (1995)]. © 1997 John Wiley & Sons, Inc. Col Res Appl, 22, 148–155, 1997

Cone activity based analysis of color‐difference data

Color Research & ApplicationVolume 20, Issue 1 p. 77-77 Communications and Comment Cone activity based analysis of color-difference data Rolf G. Kuehni, Rolf G. KuehniSearch for more papers by this author Rolf G. Kuehni, Rolf G. KuehniSearch for more papers by this author First published: February 1995 https://doi.org/10.1002/col.5080200114AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume20, Issue1February 1995Pages 77-77 RelatedInformation

Improved formula for evaluating color-differential thresholds

A new group of color-difference formulas is proposed that gives better results than the previous formulas supplied by Romero et al. [Appl. Opt. 28, 4697-4702 (1989)]. The new formulas are deduced from chromatic discrimination data and behave more consistently at the boundaries between regions of similar hue in the CIE-1931 diagram. They also fit well with experimental color-difference data.

建築仕上材料の耐傷性の評価方法に関する研究 : 視覚的観点から

The purpose of this study is to present an evaluating method of scratch resistance of finishing materials from a viewpoint of visual perception. The results of this study is as follows. 1) A scratching apparatus was newly designed and produced which can give scratching effect to the surfaces of finishing materials under conditions similar to actual circumstances. 2) Two sensory scales which indicate the degree of scratch were composed on two sets of scratched samples by means of sensory test. One set of samples were made by actual human scratching, and other set of samples were made by the scratching apparatus. The validity of the apparatus was verified from the high correlation between two scales. 3) Physical quantity properly corresponding to the sensory scales was extracted from the analysis of color difference and gloss data of the samples. 4) An evaluating method of scratch resistance of finishing materials was presented, with an evaluating index based on the relation between an evaluating scale of scratch and the physical quantity, and with a scratching method of object materials.

Color difference formulas tested by use with chromatic discrimination data and new formulas

A set of five color difference formulas, cdf-G*, one for each of five regions of the CIE1931 chromatic diagram, is proposed and compared with the CIELUV, CIELAB, and LABNHU formulas. The cdf-G* formulas fit more closely several sets of color difference data. They are useful for color difference applications.

A comparison of the CIE 1976 colour spaces

AbstractThe CIE 1976 colour spaces, CIELUV and CIELAB, have been compared by recalculating the results of a number of reported sets of experimental data. These include the results of just‐noticeable‐difference observations, colour difference scaling, colour matching ellipses, and acceptability ellipses. As a means of representing the colour difference data uniformly, it is shown that neither colour space is significantly better than the other. Attention is drawn to some anomalies in the CIELAB space.

The Farnsworth Dichotomous Test ‐ The Panel D‐15

The Panel D-15, the conditions for Its use and the rationale for Its performance are reviewed and new informatlon in the form of colour difference data Is presented. Prediction of colour defective performance using standard response functions is explained. Studies on the qualitative and quantitative value of the test for diagnosis of congenital colour vision defects are reported whlle the unlque aspects of the test for examination of acquired defects are discussed.