Patent ID: 7095964

Claim:
An image forming apparatus to which a developing apparatus for developing a latent image on an image bearing member corresponding to image information is detachably attachable, comprising: a first detection device for presuming a first remaining amount of the developer in said developing apparatus based upon the image information; a second detection device for detecting a second remaining amount of the developer in said developing apparatus; and a processing unit for determining an indicating level of the remaining amount of the developer in said developing apparatus based upon results of detections of said first detection device and said second detection device, wherein in a case that the first remaining amount of the developer presumed by said first detection device is equal to or less than an amount defined as a predetermined amount, and the second remaining amount of the developer detected by said second detection device is equal to or more than the predetermined amount, the indicating level determined by said processing unit of the remaining amount of the developer in said developing apparatus is different from both an indicating level according to the first remaining amount of the developer by said first detection device and an indicating level according to the second remaining amount of the developer detected by said second detection device.