Nickerso n and Newhall published, in 1941, the central notations of the original ISCC -NBS (Inter-Society Color Council-National Bureau of Standards) color-name blocks which were u sed in the preparat ion of the soil and rock color-name charts. In 1955, the ISCC-NBS color-nam e blocks were r evised to accord more closely with usage in the texti le and other fi eld s (NBS Circu lar 553). The central notations of these revised color-name blocks have been computed and are given in the prese nt paper in tabu lar form. A color chart s llow. ing t he central colors of the 267 ISCC--NBS color-n ame blocks wou1d se rv e for rapid determination of the J SCC-NBS color d esignation, es pecially in field wor k where spee d and ease of operation are more important than high accuracy.
The d evelopment of the Inter-Society Color Council-National Bureau of Standards (ISC C-NBS) system Qf color names, based on the standards in the Munsell Book of Color, made it necessary to specify the mas ter standards of this book in fundame ntal terms. Accordingly, spectral reflection curves were run for each of the 421 master standards on the General Electric recording spectrophotometer at the National Bureau of Standards, using slit widths of a pproximately 4 millimicrons. Various corrections were applied to these spectrophotometric data in accordance with methods regularly used for such work at the bureau. Colorimetric computations were then made with these data, resulting in tristimulus specifications according to the 1931 ICI standard observer and coordinate sy stem. :Four illuminants were used: ICI illuminants A and C, representati ve of incandescent-lamp light and average daylight, respectively, illuminant "D" (li ghtly overcast north sky), and illuminant "8" (extremely blue sky).
The Granville metameri c gray p anels have served t o characterize t he color vis ion of obser vers in a n a pproximate bu t useful way. Thu s, t he 39 observers st udi ed , an d t he fo ur color-m ixt ure fun ctions were classed i nto fi ve groups according to t he ir indica ted amo un ts of ocular pigmen tatio n. These p a nels wer e also used to m eas ure t he correlation of le ns a nd macular pigmentations wi th observer age, sex, a nd eye and ha ir colors. Of the three sets of color-m ixture fu nctio!ls inte nded to refer to 2° fi eld obser vation, t he 1931 Co mm ission Interna tiona le d e L 'Eclairage standa rd observer agrees best. _ These d ata thus a fford no basis for supplan t ing t he 193 1 Commiss ion Internat io nale de L' Ecla irage standard observer wi t h either t he J udd" i" or t he 1955 Stiles' 2° color-mixture t unctio n . The 1955 Stil es' 10° fu nctions, however, agree fa irly well.
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