MARK FORMING APPARATUS, IMAGE FORMING APPARATUS, AND MARK FORMING METHOD

摘要

A mark forming apparatus according to the present embodiment includes an image acquisition portion, a calculation portion, a detection portion, and a formation portion. The image acquisition portion scans and acquires an image formed on a sheet. The calculation portion calculates a color material attachment amount of the image from the image acquired by the image acquisition portion. The detection portion detects a predetermined mark which is already formed on the sheet. The formation portion forms a predetermined mark with a shape according to the color material attachment amount calculated by the calculation portion on the sheet in addition to the existing predetermined mark detected by the detection portion.