Abstract: In a toner image forming apparatus, a contact member for pressing a work piece at a pressing position against a toner image on a movable transfer member so that the toner image is transferred from the transfer member onto the work piece is pressed against the transfer member while a test pattern toner image which is prevented from being transferred onto the work piece moves from a transfer position at which the toner image and the test pattern toner image are transferred onto the transfer member and a detecting position at which the test pattern toner image is detected to obtain a difference between the test pattern toner image on the transfer member and a desired test pattern image.

Abstract: An exposure apparatus is set to each color so that latent-image lines formed on photosensitive drums 1a to 1d have predetermined inclinations from rotation axes of the photosensitive drums 1a to 1d to form electrostatic latent images on the photosensitive drums 1a to 1d while performing curve correction on the photosensitive drums 1a to 1d. Peripheral speeds of the photosensitive drums 1a to 1d are controlled so that inclinations of toner images of a plurality of colors on an intermediate transfer belt become equal to each other. Thereby, each pixel is not shifted when light-scanning images are superimposed each other by the exposure apparatus 3 and it is possible to obtain a high-quality image free from image deterioration due to scanning irregularity caused by inclination shifts of scanning lines 3K, 3C, 3M, and 3Y.