Patent ID: 8335441

Claim:
An image forming apparatus including: an image processing unit adapted to perform image processing of an image signal using an image processing condition; and an image forming unit adapted to form an image by electrophotography using a controlled process condition based on the image signal that has undergone the image processing, comprising: a supply unit adapted to supply toner to a developing unit based on a designated toner supply amount; said developing unit adapted to develop an electrostatic latent image formed on a photosensitive drum after agitating the supplied toner; a toner consumption prediction unit adapted to predict, based on image data representing an image, a toner consumption necessary for outputting the image; a toner supply amount decision unit adapted to decide the toner supply amount based on an image signal representing the image; an acquisition unit adapted to acquire a time of toner agitation by said developing unit; and a control unit adapted to control at least one of the image processing condition and the process condition by estimating a toner charge amount using the predicted toner consumption, the toner supply amount, and the agitation time.