Image forming system, image processing device, and recording medium

An image processing apparatus comprising:

• a first image forming device,
• a second image forming device that is connected in series on a downstream side with respect to the first image forming device;
• and
• an image reading device that is connected on a downstream side with respect to the first image forming device and the second forming device,
• wherein the first image forming device includes a first hardware processor,
• wherein the second image forming device includes a second hardware processor,
• wherein the image reading device includes a third hardware processor,
• wherein the first hardware processor causes a first image former of the first image forming device to form a first reference image on a first face of a sheet;
• wherein the second hardware processor causes a second image former of the second image forming device to form a second reference image different from the first reference image on the first face of the sheet on which the first reference image is formed;
• wherein the third hardware processor determines whether an image positional deviation is present based on the first reference image and the second reference image that are formed on the first face of the sheet respectively by the first image former of the first image forming device and the second image former of the second image forming device and that are read by the image reading device.

A non-transitory computer-readable storage medium storing a program for an image forming system,

• wherein the image forming system comprises:
• a first image forming device,
• a second image forming device that is connected in series on a downstream side with respect to the first image forming device;
• and
• an image reading device that is connected on a downstream side with respect to the first image forming device and the second forming device,
• wherein the program causes a computer provided in the image forming system to:
• cause a first image former of the first image forming device to form a first reference image on a first face of a sheet;
• cause a second image former of the second image forming device to form a second reference image different from the first reference image on the first face of the sheet on which the first reference image is formed;
• and
• determine whether an image positional deviation is present based on the first reference image and the second reference image that are formed on the first face of the sheet respectively by the first image former of the first image forming device and the second image former of the second image forming device and that are read by the image reading device.