Direct-reading color-difference meter based on cube-root color coordinates.
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.
Faulhaber
M E
ME
Witherell
P G
PG