The dependence of corresponding colors on different chromatic adaptations has been studied by a method of local adaptation. Both eyes were exposed simultaneously to the same colors. Observations of one second duration were alternated with adaptation periods of nine seconds duration. Differenta dapting colors appeared in the two halves of a simple colorimeter field, which had a vertical dividing line. The observer kept his gaze fixed upon the center of that line. He then adjusted the colorimeter which produced the color which replaced the adaptation color in one half of the field, so that during the one-second observation it appeared to match the color which replaced the other adapting color. The colors which appeared to match under these conditions were compared with the predictions of Von Kries’s trireceptor coefficient law. Various modifications of that law were tried. Systematic discrepancies from predictions of laws of this form were analyzed. An hypothesis of five different receptors whose responses are merged onto three channels in the nervous system was found adequate to account for almost all of the experimental findings. The presence of a sixth different adapting process in the retina was indicated in one case.
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The chromaticity coordinates x, y, x′, y′ listed in Tables I to VI were computed from the original tristimulus values, X, Y, Z, X′, Y′, Z′ before the latter were rounded off to one decimal place, as listed in Tables I to VI. There are, for this reason, some slight numerical inconsistencies between the tabulated tristimulus values and the chromaticity coordinates. The experimental uncertainties are not more than a few units in the next to the last digit listed. In some cases, such as tristimulus values less than 10, the uncertainties are confined to the last digit.
In terms of the notations used in Tables I, II, and IV, the predictions are of X or X′, Y or Y′, Z or Z′, corresponding to the directions of prediction specified in the legends of Figs. 7–10. The quantities designated X, Y, Z in the formulas in Table VIII are either X or X′, Y or Y′, Z or Z′, corresponding to the basis of prediction specified for the corresponding diagram in Figs. 7–10.
Table IX
Primaries deduced from least-squares prediction formulas.
The chromaticity coordinates x, y, x′, y′ listed in Tables I to VI were computed from the original tristimulus values, X, Y, Z, X′, Y′, Z′ before the latter were rounded off to one decimal place, as listed in Tables I to VI. There are, for this reason, some slight numerical inconsistencies between the tabulated tristimulus values and the chromaticity coordinates. The experimental uncertainties are not more than a few units in the next to the last digit listed. In some cases, such as tristimulus values less than 10, the uncertainties are confined to the last digit.
In terms of the notations used in Tables I, II, and IV, the predictions are of X or X′, Y or Y′, Z or Z′, corresponding to the directions of prediction specified in the legends of Figs. 7–10. The quantities designated X, Y, Z in the formulas in Table VIII are either X or X′, Y or Y′, Z or Z′, corresponding to the basis of prediction specified for the corresponding diagram in Figs. 7–10.
Table IX
Primaries deduced from least-squares prediction formulas.
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