Patent ID: 7860413

Claim:
An image forming apparatus comprising: a color density adjustment value-adjusting unit adapted to adjust a color density adjustment value in predetermined adjustment timing so as to keep colors of an image constant; a color density adjustment value-storing unit adapted to store a history of the color density adjustment value in advance; an adjustment timing occurrence-determining unit adapted to determine whether or not the adjustment timing occurs during execution of an image forming job; and a color density adjustment value-predicting unit adapted to predict the color density adjustment value in the adjustment timing determined to occur, based on the history of the color density adjustment value stored in advance, wherein said color density adjustment value-adjusting unit is adapted to (a) adjust the color density adjustment value based on the predicted color density adjustment value during execution of the image forming job in a situation that the adjustment timing occurrence-determining unit determines that the adjustment timing occurs during execution of the image forming job, and (b) adjust color density adjustment value otherwise during a period of time when the image forming job is not being executed in a situation that the adjustment timing occurrence-determining unit determines that the adjustment timing does not occur during execution of the image forming job.