Patent ID: 7843604

Claim:
An image correcting apparatus comprising: a first calculating unit that calculates a blank position of dither matrixes used for performing a dither process on an image, the blank position being a position in the dither matrixes at which an image pattern is not present, based on a main-scanning size and an interval between the image patterns in the dither matrixes, the main-scanning size is a size of each of the dither matrixes in a main-scanning direction, and determines the blank position as one of image-shift possible positions, the image-shift possible positions are candidate positions where the image can be divided when performing skew-correction on the image; a second calculating unit that calculates an image dividing position where the image is divided when performing skew-correction on the image based on amounts of misregistration between a reference color and each of other colors in the image; a determining unit that compares the image-shift possible positions with the image dividing position and determines one of the image-shift possible positions closest to the image dividing position to began image shift position; and a correcting unit that performs skew-correction on the image by dividing the image at the image shift position.