This thesis describes the technique of principle component analysis as applied to determining if a combination of three characteristic vectors would account for an underlying structure in the eight color test objects specified by the CIE for calculation of the color rendering index (CRI). Anticipated was that three vectors would account for 100 % of the variance in the eight test objects; however it was determined that three vectors account for only 96 % of the variance. Since the analysis of the reflectance functions showed no dependence within the functions a 3^3 factorial experiment was conducted. Its purpose was to determine if the point of maximization of CRI in a three component spectral power distribution would be at 610, 540, and 450 nm when using metameric gray objects. This was postulated by Mr. Thornton in his paper "Luminosity and the Color Rendering Capability of White Light". The analysis of the resulting response surface indicated that the maximization point was not the same but if a valid point exists it lies outside the experimental boundaries of the experiment.
Library of Congress Subject Headings
Color sensitometry (Photography)
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
Miller, Gregory, "The Influence of Test Colors on the Color Rendering Index Maximization in a Three Component Spectral Power Distribution" (1976). Thesis. Rochester Institute of Technology. Accessed from
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