Information processing apparatus and image forming apparatus for improving accuracy of a diagnostic image

An information processing apparatus comprising:

• a processor configured to:
• acquire a read image resulting from reading a recording medium where a diagnostic image to be used to diagnose an image forming apparatus is formed;
• acquire, from the read image, an image read portion of the recording medium from which the diagnostic image is read and one specific portion of a non-formation read portion, the non-formation read portion resulting from reading a non-formation portion of the recording medium where the diagnostic image is not formed;
• generate a synthesis image that is obtained by combining the read image portion and the one specific portion;
• and
• output the synthesis image including the combination of the image read portion and the one specific portion.