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Several color spaces utilize angular measures of hue:for example, CIE 1976 u, v hue‐angle; CIE 1976 a, b hueangle. Such measures are not amenable to conventional statistical analysis, unless a categorization of hue‐angles has previously been decided upon, in which case nonparametric tests are...
A way has been found to plot the mixture data of a protanope or a deuteranope on a constant luminance mixture diagram to show that the confusion lines are parallel to the line tangent to the red end of the spectrum locus. In the case of a tritanope the confusion lines are parallel to each other...
Numerical methods for estimating colorimetric integrals using various data intervals are reviewed. Accuracy of Newton‐Cotes and Gaussian numerical integration algorithms are compared. Tables of calorimetric data for performing Gauss‐Legendre integration are presented. Appropriate numerical...
This article quantifies errors arising from various integration methods and from sampling density in the numerical estimation of colorimetric integrals, e.g., tristimulus values. Both data sampling density and various numerical integration method errors will be distinguished. A test is presented...
The Colour Measurement Committee (CMC) formulas for color‐difference acceptability do not describe ellipsoids in CIELAB space, but the literature describes the acceptability surfaces as ellipsoids. It turns out that the discrepancy does not affect computational results (as long as the CMC...
Details of an expanded and improved computer program for the interconversion of colour notations are presented. This article describes the inclusion of the Colorcurve, SCA 2541, and HunterLab systems, expansion of the DIN and RAL implements, extension of the NCS aim point database, improvements...
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