| 摘要 |
An apparatus includes a unit configured to judge a border between two patch images among a plurality of patch images formed on the recording material, based on change in the amount of the light beam of at least one noticed wavelength detected by a detection unit; a unit configured to calculate a color value of a patch image from the amount of the light beam of each wavelength detected by the detection unit; and a control unit configured to control an accumulation period of charge for the photoelectric conversion at the detection unit. The control unit is further configured to make the accumulation period of the detection unit shorter when judging the border between the two patch images than when calculating the color value of each of the two patch images.
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