| 摘要 |
A color image formation apparatus includes a mark detection device that detects each of marks of a toner pattern, and a positioning operation control device that controls a positioning operation of correcting color deviation by changing write time setting based on the detection result of the mark detection device. The mark detection device reads a background of a conveyance member. A detection performance of the mark detection device is changed in accordance with a stein level of the background so that a prescribed reference level is obtained from the background. A start control device is provided to start the positioning operation when a prescribed positioning operation start condition is met and starts the detection performance correction operation when a prescribed detection performance correction operation start condition different from the positioning operation start condition is met.
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