Image forming system for reducing wrong printing order

An image forming system, comprising:

• a first image forming apparatus including a first image forming unit the forms an image with a first developer of a process color;
• a second image forming apparatus including a second image forming unit that includes a second developer and that forms an image with the second developer, the second developer having characteristics different from characteristics of the first developer on a medium;
• and
• a processor controlling the first image forming apparatus and the second image forming apparatus, wherein the processor configured to:
• determine, on a basis of image formation conditions designated by a user, a printing order in which an image formed with the first developer and an image formed with a second developer are printed on one medium, and determine a sequence in which the image forming apparatuses perform image formation on a basis of the determined printing order;
• execute processing based on a gaze direction in which images on the medium are viewed or a hue expressed by superposing a plurality of images formed with the developers one on another as the designated image formation conditions;
• and
• display the determined sequence.