Method for maintaining uniformity among color measuring instrume

Optics: measuring and testing – By shade or color – With color determination by light intensity comparison

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356402, G01J 346

Patent

active

060438940

ABSTRACT:
A method for maintaining substantial reliability of color measurements obtained by a number of color measuring instruments includes by measuring color values of a set of master color standards on a master color measuring instrument at a master color lab, and measuring color values of sets of working color standards on the same instrument to determine calibration values. The working sets are provided to remote locations for use on remote color measuring instruments and the working sets are measured on the remote color measuring instruments to obtain color value measurements which are transmitted to the master color lab. The measurements from the remote instruments are compared with the calibration values obtained from measurements on the master instrument to generate profiles which are provided to the remote color labs. The profiles are applied to measured color values for the set of working color standards to obtain corrected color values. These values are transmitted to the master color lab and analyzed to determine compliance with specifications as to permissible deviations.

REFERENCES:
patent: 4812904 (1989-03-01), Maring et al.
patent: 5774230 (1998-06-01), Goto

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