IMAGE FORMING APPARATUS, IMAGE PROCESSING APPARATUS, PRINTING MEDIUM, IMAGE PROCESSING METHOD AND STORAGE MEDIUM READABLE BY COMPUTER

An image forming apparatus includes: a document image generating portion that generates a document image which is instructed to be printed; a code image generating portion that generates a code image indicating a position on a medium; an accepting portion that accepts information indicating at least one of a first mode and a second mode, wherein a print image including the document image and the code image being printed in the first mode and a print image including the code image but not including the document image being printed in the second mode, and a printing portion that prints the print image on the medium in the mode pointed by information that the accepting portion accepts.