Patent ID: 8817322

Claim:
An image processing apparatus for a print execution unit that is configured to print a dot image, the image processing apparatus comprising: a processor configured to operate as: a change processing unit configured to execute change processing of changing a pixel-number ratio S of a second direction to a first direction for distortion-free image data expressing a distortion-free image having the pixel-number ratio S to acquire distorted image data expressing a distorted image having the pixel-number ratio of p×S, wherein S is more than zero and p is more than 1; and a halftone processing unit configured to execute halftone processing for generating dot data, which expresses a formation state of a dot for each pixel, on the distorted image data having the pixel-number ratio of p×S by using a dither matrix so as to generate distorted dot data expressing a distorted dot image having the pixel-number ratio of p×S, wherein the distorted dot data is used for printing a distortion-free dot image in the print execution unit, wherein the distortion-free dot image is to be obtained by enlarging the distorted dot data in at least the first direction, the distortion-free dot image having the pixel-number ratio S, and wherein a screen angle of the dither matrix is set to be about arctan((tan θ)/p)) when a screen angle in the distortion-free dot image is θ.