Patent ID: 8144375

Claim:
An image forming apparatus comprising: a first image reader configured to read an image at a first scan speed via a filter, which passes light of a specific wavelength band, and convert the image to image information; a second image reader configured to read an image at a second scan speed, which is higher than the first scan speed, and convert the image to image information; a plurality of image forming stations that are associated with different colors; a first printer configured to print an image on the basis of the image information that is read by the first image reader on a paper, and to form a color image by synchronously operating the plurality of image forming stations; a second printer configured to print an image on the basis of the image information that is read by the second reader on a paper, to form a single-color image by operating a predetermined one of the plurality of image forming stations at a higher speed than the first printer, and to form the single-color image by using the image forming station of a black color; and a developing unit provided in the image forming station of a black color and that is capable of accommodating an amount of developing agent larger than that accommodated in each of the developing units provided in the image forming station of a color that is different from black.