Patent ID: 7701624

Claim:
An image-forming device, comprising: an image-forming portion that forms images based on image data on a recording medium; a memory having a storage area and a backup storage area; a correction data generating portion that generates, upon receipt of a calibrate command, a set of correction data based on printing density formed by the image-forming portion based on the image data and writes the generated set of correction data in the storage area, the set of correction data corresponding to printing characteristics of the image-forming portion; a printing control portion that performs image-forming operation to correct image data, indicative of an image desired to be formed, based on the set of correction data stored in the storage area and to control the image-forming portion to form the desired image on the recording medium based on the corrected image data; a monitoring portion that monitors a performance value, indicative of a degree of performance with which the printing control portion executes its image-forming operation by using the correction data stored in the storage area, the monitoring portion monitoring, as the performance value, the number of printed pages, onto which the image-forming portion performs its image-forming operation by using the correction data stored in the storage area; a backup storage portion that automatically writes the set of correction data stored in the storage area into the backup storage area only when the performance value monitored by the monitoring portion exceeds a reference performance value; and a restoring portion that restores, in response to a restore command, the set of correction data that is stored in the backup storage area back into the storage area.