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Abstract In the ten years since the last Inter‐Society Color Council conference on color discrimination considerable progress in industrial color‐difference evaluation has been made. The results of a questionnaire indicated that the efforts of the CIE to make formula usage more uniform has been successful. Efforts to improve the correlation between average visual judgment and calculated color difference have also resulted in progress. Nevertheless, a considerable amount of work remains to be done regarding the mechanisms affecting color‐difference evaluation before instrumental color‐difference evaluation can become a highly reliable tool of manufacturing.
Rolf G. Kuehni (Mon,) studied this question.