Patent ID: 7643763

Claim:
An image forming apparatus for forming on a photosensitive member a monochromatic image or a color image represented by a plurality of color components, comprising: first totaling means for totaling pixel values of monochromatic component of each pixel of an image formed on said photosensitive member when a monochromatic image is formed on said photosensitive member; second totaling means for totaling pixel values of monochromatic component of each pixel of an image formed on said photosensitive member when a monochromatic image is formed on said photosensitive member, and totaling pixel values of predetermined color component of each pixel of an image formed on said photosensitive member when a color image is formed on said photosensitive member; and a first monochrome forming means for forming odd number lines of a monochromatic image on said photosensitive member; and a second monochrome forming means for forming even number lines of the monochromatic image on said photosensitive member; wherein when a monochromatic image is formed on said photosensitive member, said first totaling means totals pixel values of monochromatic component of each pixel of the image formed on said photosensitive member by one of said first monochrome forming means and said second monochrome forming means, while said second totaling means totals pixel values of monochromatic components of each pixel of an image formed on said photosensitive member by the other of said first monochrome forming means and said second monochrome forming means.