Liquid ejection apparatus provided with nozzles located at different positions in conveying direction

Abstract

A liquid ejection apparatus corrects image data by: setting a to-be-corrected dot element; acquiring a correction amount based on an offset between a formation position at which a dot corresponding to the to-be-corrected dot element is to be formed on a recording medium while the recording medium is conveyed the reference conveyance amount per unit time and a formation position at which a dot corresponding to the to-be-corrected dot element is to be formed while the recording medium is conveyed a conveyance amount different from the reference conveyance amount per unit time; and executing correction on the to-be-corrected dot element. The correction is executed by setting a density value for the to-be-corrected dot element as that for corresponding one dot element whose data array order is shifted from a data array order of the to-be-corrected dot element by the number of dot elements corresponding to the correction amount.