Abstract

In the first part of the paper, a field trial is made with a large size photometer, the two halves of which are illuminated by fluorescent and tungsten lamps, respectively, to test the agreement between the observed chromaticities and the chromaticities predicted from spectroradiometric data on the basis of four sets of color matching functions: (i) the CIE 1931 Standard Observer; (ii) Stiles’s 2° pilot data; (iii) the CIE 1951 proposed modified data; and (iv) the CIE 1963 Supplementary Observer for 10° field. The results indicate a poor correlation by the supplementary observer.

In the second part, a similar comparative study is made by an evaluation of the chromaticity differences, on the basis of both MacAdam’s standard-deviation ratio and separation in the UCS diagram, between twenty-six near-white wool surfaces. The supplementary observer seems to have a lower discrimination than the others.

© 1965 Optical Society of America

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