Abstract

The comparative performance of fifteen different color-measuring instruments was studied for precision (short-term repeatability) and accuracy of color measurement and of color difference measurement. For estimates of accuracy, a GE spectrophotometer was considered the referee instrument. The instruments tested included two integrating sphere spectrophotometers, six integrating sphere colorimeters (four of which were individually calibrated for close conformance to CIE coordinates), and seven 45°/normal colorimeters (four of which were individually calibrated for close conformance to CIE coordinates). Up to fifty-three samples were measured, most of them several times, on each instrument. Paint panels, plastics, porcelain enamels, and ceramic tiles were among the samples used. Overall, the well-established IDL D–1 Signature Color-Eye colorimeter-abridged spectrophotometer and the Hunter D25 Color and Color Difference Meter demonstrated the best and next best performance, respectively, in all categories. Several other instruments, both well established and new, were outstanding in one or more respects. All production instruments tested gave generally satisfactory results.

© 1969 Optical Society of America

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