METHOD FOR CORRECTING COLOR FILTER-TYPE CHROMAMETER AND COLOR FILTER-TYPE CHROMAMETER

摘要

This color filter-type chromameter prevents error from occurring in a measured value after all corrected. Three spectroscopic sensors provided in the color filter-type chromameter have spectroscopic responsivenesses different from each other and respectively output three signals in response to colors to be measured. Performed is the transformation from three pre-correction measurement values respectively indicating the sizes of three signals into three post-correction measurement values. A three-dimensional color space before correction is nonlinearly transformed into a three-dimensional space after correction so that the transformation is performed from the three pre-correction measurement values in the three-dimensional color space before correction into the three post-correction measurement values in the three-dimensional space after correction. The transformation is determined so that the transformation is performed from measurement values of colors before correction, which are specific values of the pre-correction measurement values, into reference values of respective colors when each of colors R, G, B, and W is the color to be measured. Four or more spectroscopic sensors can also be substituted for the three spectroscopic sensors.