Apparatus, method, and storage medium for improving print quality of an image

A printing apparatus that prints an image of a first colorimetric system that is constructed with a plurality of pixels by using dots having a plurality of sizes, comprising:

• a print head that ejects a printing material to form the dots on a printing medium;
• a color conversion unit that converts the image in the first colorimetric system to an intermediate image in a second colorimetric system that can be printed by the printing apparatus;
• a detection unit that detects:
• edge pixels, which constitute an edge of the intermediate image, among a plurality of pixels constituting the intermediate image, and
• edge adjacent pixels, on which the dots are formed and which are located in a predetermined distance from the edge pixels, among the plurality of pixels constituting the intermediate image;
• a dot allocation unit that allocates:
• dots having a predetermined size among the dots having the plurality of sizes to the edge pixels, and
• dots having a size, which is defined according to a distance from the edge pixels, among the dots of a plurality of sizes to the edge adjacent pixels;
• and
• a printing unit that controls the print head based on printing data indicating the dot allocation to form the image on the printing medium.