Patent ID: 7999979

Claim:
An image forming apparatus, comprising: image forming means for forming electrostatic latent images of images respectfully constituted of multiple pixels on a photosensitive member, and forming images by developing the electrostatic latent images formed on said photosensitive member by toner, wherein said image forming means forms plural of said electrostatic latent images of images on said photosensitive member; image discriminating means for discriminating a kind of an image formed on said photosensitive member by said image forming means; and a totaling unit for totaling pixel values of a pixel constituting said plural images formed on said photosensitive member by said image forming means, by a respective kind of the image in accordance with a discrimination result by said image discriminating means, wherein said totaling unit comprises a first counter and a second counter; said first counter totals pixel values of predetermined kinds of images, which are developed with toner by the image forming means, among said plurality of images formed by said image forming means; and said second counter totals pixel values of other kinds of images, which are not developed with toner by the image forming means, among said plurality of images formed by said image forming means.