To provide an image forming apparatus that carries out tone correction after recognizing the toner charge amount of an engine that has an effect on a tone in an image forming apparatus, after the start-up of power supply.

An image forming apparatus of the present invention includes developing means for developing an electrostatic latent image formed on an image carrier and forming a visible image. The image forming apparatus further includes: means for detecting the toner charge amount of a developing unit at the start-up of power supply; means for creating a parameter based on the toner charge amount; and means for carrying out tone correction in an image processing part using the parameter and an LUT for the standard toner charge amount, which is prepared in advance.