Abstract

Recent work by Jacobsen in the colorimetry of titanium pigments has indicated that the ICI standard observer weights too lightly the spectral region below 430 mμ to accord with visual perception by average observers. This paper presents a repetition of this work for a single pair of titanium-pigment paints whose difference was measured by spectrophotometric means and then by seven observers by means of a visual colorimeter. Four of the seven observers corroborated Jacobsen’s conclusion; three checked closely the standard observer. A modified standard observer based upon the spectral luminosity determinations of Gibson and Tyndall and Wald has been derived and is shown to account closely for the settings of the group of four observers that disagreed with the standard observer.

© 1949 Optical Society of America

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Corrections

Deane B. Judd, "Errata: A Comparison of Direct Colorimetry of Titanium Pigments with Their Indirect Colorimetry Based on Spectrophotometry and a Standard Observer," J. Opt. Soc. Am. 40, 52-52 (1950)
https://www.osapublishing.org/josa/abstract.cfm?uri=josa-40-1-52

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