Patent ID: 7684079

Claim:
An image forming apparatus in which image forming units each having an image carrier, an exposure unit for scanning exposure on the image carrier, and a developing unit for visualizing an electrostatic latent image generated by exposure using a color former are juxtaposed in a conveying direction of a print medium, comprising: image data storage means for storing image data to be formed by each image forming unit; exposure shifting amount storage means for storing shifting amount information indicating a shifting amount with respect to a scanning direction on the image carrier of each image forming unit; coordinate conversion means for converting coordinates of a read address of said image data storage means on the basis of the exposure shifting amount information stored in said exposure shifting amount storage means, and reading out image data according to the converted address information; correction means for correcting a tone of pixel data read out by said coordinate conversion means on the basis of the converted address information; halftone means for applying predetermined halftone processing to the pixel data obtained by said correction means; and output means for outputting the pixel data obtained by said halftone means as an exposure control signal of the exposure unit of the corresponding image forming unit.