Abstract

Equivalent luminance of a color, which allows it to be classified visually in relation to a progression of achromatic luminances, is one of its characteristic parameters. Equivalent luminance has been measured for many chromaticities and luminance levels, extending from less than one to more than two hundred cd/m², with a heterochromatic wide-field photometer built for this investigation. A generalized photocolorimetric grid, proposed for the representation of these results, is capable of accommodating all possible colors of light; this grid is cylindrical, each of its plane horizontal sections being a CIE u, v chromaticity diagram, and its vertical axis carrying a log-luminance scale, on which one unit of log-luminance has the length of one tenth of the unit on either the u or v axis.

© 1969 Optical Society of America

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