An image forming apparatus capable of forming an image on a perforated sheet includes an image forming portion for forming a toner image with toner of a plurality of colors, an image processing portion for performing image processing on image data acquired, and a controller for controlling the image processing portion to form the toner image on the basis of the image data processed by the image processing portion. In a case that a sheet on which the toner image is to be formed is the perforated sheet, the image processing portion performs the image processing so that black image data is formed as image data of process black with the toner of the plurality of colors by the image forming portion.

There is provided a control method for controlling an operation of a three-dimensional object printing apparatus including a liquid discharge head that discharges liquid toward a workpiece, and a movement mechanism that moves the liquid discharge head, the method including a trajectory information generation step of generating trajectory information related to a movement trajectory along which the movement mechanism moves the liquid discharge head, a correspondence information generation step of generating correspondence information in which the trajectory information, head information related to the liquid discharge head, and first image information related to a first image to be printed are associated, a storage step of storing the correspondence information, and a printing data generation step of generating printing data for printing a second image based on the correspondence information and second image information related to the second image to be printed.