Abstract

Photoelectric colorimeters can be used as differential instruments to determine the ratios of tristimulus values of similar coloring materials to a high degree of precision. In the past, the difficult and time-consuming methods of calculating color coordinate differences from such data have seriously hindered their practical usefulness. It is shown that such calculations can be very greatly simplified for small color differences by making use of an approximation that becomes increasingly better as the color difference becomes smaller.

© 1959 Optical Society of America

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