On the basis of a more accurate calibration of the Donaldson colorimeter, a reanalysis of the 1958–1959 NRC field trials of color-matching functions was carried out. This has resulted in a revision of some of the conclusions reached with regard to the 10° color-matching functions proposed by the CIE in 1959. The results of the reanalysis strongly suggest that the proposed 10° color-matching functions predict adequately the observations made by actual observers on the Donaldson colorimeter. A failure of additivity in large-field color matching cannot be detected with certainty for the observational mean of 10 observers. However, for individual observers there remains the possibility of a failure of additivity.
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