Patent ID: 7903304

Claim:
A print control apparatus comprising: a band buffer for storing a 1-band image; an image correcting unit for correcting images stored in the band buffer based on a correction amount in a sub-scanning direction at a plurality of paper positions; an intermediate buffer for storing images corrected by the image correcting unit that lie outside a band area; and an image output unit for outputting images including images stored in the intermediate buffer and images of a next band corrected by the image correcting unit that lie inside the band area; wherein the image correcting unit calculates Z, a correction amount in the sub-scanning direction at a pixel position in a main scanning direction, according to the following formula: Z= 2( R+L −2 M )( X/W )2+( R − L )( X/W )+ M, where L represents the correction amount in the sub-scanning direction at a left end of paper, M represents the correction amount in the sub-scanning direction in a center of paper, R represents the correction amount in the sub-scanning direction at a right end of paper, X represents the correction amount in the sub-scanning direction in the main scanning direction, and W represents a width of paper, and wherein the image correcting unit corrects the images stored in the band buffer based on the calculated correction amount in the sub-scanning direction Z.