The field trials consist essentially of comparisons between the instrumental readings of the three primaries of the Donaldson colorimeter in matches on a number of filter colors (a) as obtained by actual observers and (b) as computed from the spectral energy distributions of the stimuli provided by the filter colors on the basis of various sets of color-mixture functions. In particular, the field trials were directed to test the proposed 10° standard color-mixture functions derived by Judd from the Stiles-Burch and Speranskaya data. It was found that the agreement between the chromaticities of 18 filter colors, as measured on the Donaldson colorimeter and as predicted from the proposed 10° standard color-mixture functions, was in some respects unsatisfactory. Various possible causes of the discrepancies were followed up by additional measurements and computations. However, for several filter colors, especially the blue to blue-green and near-white colors, the discrepancies remain unexplained. It seems conceivable that Grassmann’s laws of color mixture do not strictly apply to large-field color matching, although no specific experiments were included in the present investigation.
© 1962 Optical Society of AmericaFull Article | PDF Article
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