Patent ID: 8064094

Claim:
An image forming apparatus for forming an image from image data formed with a plurality of pixels, the image forming apparatus comprising: a position deciding unit to determine a correction target position in the image data from a position of a reference pixel in the image data based on a size-adjustment proportion, the correction target position having a sub-scanning position and a main-scanning position; a correcting unit to perform correction with respect to the correction target position; and a size adjusting unit to adjust a size of the image data to obtain size adjusted image data by performing sub-scanning direction processing including causing the position deciding unit to sequentially determine positions of a plurality of correction target pixels in one line of pixels along a sub-scanning direction and causing the correcting unit to sequentially perform correction with respect to the correction target positions, and performing main-scanning direction processing including performing the sub-scanning direction processing for all the lines of pixels in the sub-scanning direction wherein the position deciding unit determines the correction target position in the sub-scanning direction according to at least a shift amount between pixels in the sub-scanning direction times a residue of a main-scanning position of the correction target position divided by the shift amount.