Abstract

The results of colorimetric measurements in the mesopic range require the division of this range into two parts; an upper mesopic range, in which only modifications of the color mixture functions occur and in which the error of the green-blue ratio measurement increases with the reduction of the luminance of the colorimetric field; and a lower mesopic range, in which the vision becomes dichromatic, the green-blue ratio being entirely uncertain. A quantitative connection between the modifications undergone by the color mixture functions and those undergone by the relative luminous efficiency function as a consequence of the reduction of the luminance of the visual field is proposed and checked by the good agreement with the experimental results. The dichromatic chromaticity coordinates of the spectrum colors in the lower mesopic range were calculated and found in good agreement with the experimental dichromatic chromaticity coordinates of Willmer and Wright valid for the dichromatic vision at very reduced extents of the visual field. Preliminary results in the range of excessive luminances are briefly reported.

© 1958 Optical Society of America

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