Color offset correction in sub scanning

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Color offset correction in sub scanning
When R, G and B are not accurately synchronized in sub scanning, the color offset correction will be made so that RED and BLUE synchronize with GREEN by shifting RED and BLUE image within single pixel in the sub scanning direction.
Example)
For GREEN, RED offsets upward and BLUE offsets downward in the scan for black line image.
MEMO:
Outstanding point of this CCD unit:
Corrective values are different by the position in the main scanning.
There are 12 corrective values in the book scan and 4 values in the ADF scan for the color offset correction. The color offset corrections have been made at the factory and all the corrective values have been stored in the service mode. (In COPIER > ADJUST > CCD)
At the beginning of job, color offset correction is performed based on the stored corrective values.

| Book scan | ADFADF scan
100% | 50% | 100% | 50%
Main scanning position 0 (rear) | 100-RG 100-GB | 50-RG 50-GB | 100DF-RG 100DF-GB | 50DF-RG 50DF-GB
Main scanning position 1 (center) | 100-RG-2 100-GB-2 | 50-RG-2 50-GB-2
Main scanning position 2 (front) | 100-RG-3 100-RG-3 | 50-RG-3 50-GB-3