Image forming apparatus, method of adjusting image formation, and storage medium storing image data for adjustment of image formation

摘要

A non-transitory computer-readable storage medium (12) stores image data for adjustment of image formation. The image data includes a cross-hair (1) formed in a corner of a recording medium, and a corner edge detection mark (2) formed to detect a folded corner edge of the recording medium from read data obtained when the corner of the recording medium including an area where the cross-hair (1) is formed on one side is folded to an opposite side to the one side of the recording medium and an image reader (300) reads the opposite side.