| 摘要 |
Based on a read value of a calibration reference chart including achromatic patches and chromatic patches having different concentrations and a reference value of the calibration reference chart, a masking coefficient according to each hue area is calculated. A gradation conversion is performed on an image signal output from an image reading unit. The image signal is corrected based on the masking coefficient. Consequently, it is possible to reduce a difference in performance of a scanner between units.
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