Patent ID: 8376495

Claim:
A printing apparatus that performs printing by moving a print head in main scan directions relative to a printing medium, comprising: an input unit that inputs image data constituting an image; a halftone processing unit that converts the input image data to dot data indicating whether or not dots are formed; and a printing unit that performs printing by controlling ejection of ink from the print head based on the result of the halftone process, in a printing area where an ink duty is in a predetermined range, the printing unit being configured to form dots by a relative forward movement in which the print head relatively moves in a first direction of the main scan directions and backward movement in which the print head relatively moves in a second direction opposite to the first direction so that a forward-moving dot occurrence ratio that is a ratio of forming the dots by the relative forward movement with respect to the ink duty is decreased, as the ink duty is increased, and so that a backward-moving dot occurrence ratio that is a ratio of forming the dots by the relative backward movement with respect to the ink duty is increased, as the ink duty is increased.