Patent ID: 7457556

Claim:
An image forming apparatus including an image forming unit configured to form an image, using light toner and dark toner of which a density is higher than a density of the light toner in a same color system, by starting mixing the light toner with the dark toner at a signal level of image data, the signal level being equal to or higher than a predetermined signal level of the image data, the image forming apparatus comprising: a density detection unit configured to detect a density of a pattern image formed with the light toner without using the dark toner; and a control unit configured to control image forming conditions of the image forming unit in such a manner that the density of the pattern image detected by the density detection unit is equal to a target density of the pattern image, wherein the control unit changes the predetermined signal level to a lower signal level when the detected density of the pattern image does not obtain the target density even if the image forming conditions are controlled.