Image forming system

An image forming system comprising:

• a first image forming apparatus that forms an image of a process color;
• and
• a second image forming apparatus that forms an image of the process color and a spot color,
• wherein the first image forming apparatus and the second image forming apparatus use the process color to form positional-adjustment images for adjusting image formation positions between the first image forming apparatus and the second image forming apparatus.

An image forming system comprising:

• first image forming means including image forming means that at least forms an image of a first color;
• and
• second image forming means including image forming means that forms an image of a second color different from a color of an image formed by the image forming means of the first image forming means and also including image forming means that forms an image of the first color,
• wherein the first image forming means and the second image forming means use the first color to form positional-adjustment images for adjusting image formation positions between the first image forming means and the second image forming means.