1. An image forming device comprising: a color calibration pattern generating unit that generates a color calibration pattern; an altering unit that alters a form of the color calibration pattern, generated by the color calibration pattern generating unit, according to the area where it is to be formed; and a visualizing unit that visualizes the color calibration pattern altered by the altering unit, wherein the visualizing unit comprises an image forming unit that forms an image on a recording medium, the altering unit splits the color calibration pattern according to an area in the recording medium where formation of the color calibration pattern is permitted, and the image forming unit forms the color calibration pattern split by the altering unit on a plurality of recording media.