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Direct-Reading Color-Difference Meter Based on Cube-Root Color Coordinates

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Abstract

This paper describes a new instrument, based on the cube-root system of color coordinates, which reads color-difference coordinates directly. Silicon photovoltaic cells are used with glass filters to produce electrical signals proportional to tristimulus values. Tristimulus signals from a reference and a sample are converted to coordinate differences by means of simple, solid-state circuitry. Because operation of the instrument requires no mechanical adjustment or data entry, a color difference can be measured in about 15 sec. Excellent precision and stability have been demonstrated.

© 1971 Optical Society of America

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