Patent ID: 8073349

Claim:
An image forming apparatus comprising: a toner image forming unit configured to irradiate a photosensitive member with light to form an electrostatic latent image, and to develop the electrostatic latent image with toner to form a toner image; a contrast potential determination unit configured to determine a contrast potential as a difference between a surface potential of the photosensitive member which is not irradiated and a surface potential of the photosensitive member which is irradiated; a measuring image forming unit configured to form a density measuring toner image using the toner image forming unit; a density measuring unit configured to measure a density of the density measuring toner image; a first determination unit configured to determine a first contrast potential according to an environment condition of the image forming apparatus; a second determination unit configured to determine a second contrast potential of forming a toner image, based on a difference between a target density and the measured density of the density measuring toner image; and a setting unit configured to set, after the second contrast potential has been determined, a contrast potential to be set in order for the toner image forming unit to form the toner image, to any one of the first contrast potential and a third contrast potential which is lower than the first contrast potential, according to a ratio of the second contrast potential to the first contrast potential, the first contrast potential and the third contrast potential varying according to the environment condition.