An image processing apparatus includes a halftone processing unit configured to apply halftone processing based on a dither matrix to image data, a correction unit configured, with respect to the processed image data, to shift a pixel of the image data in a sub-scanning direction at a correction position in a main scanning direction which is determined based on correction information for correcting a distortion due to a curve of a scanning line for forming an image according to the image data, and a resolution conversion unit configured to apply resolution conversion processing for lowering a resolution of image data to the corrected image data, wherein the dither matrix results in that the image data to which the resolution conversion processing has been applied includes matched portions of halftone dot patterns appearing in regions preceding and following the correction position in the main scanning direction.