Image processing apparatus, medium, and method

A non-transitory and computer-readable medium storing a program which is executable by a controller for a print executor having a head, the head including a first nozzle configured to discharge a first ink and a second nozzle configured to discharge a second ink, a kind of the first ink and a kind of the second ink being different from each other, a position of the first nozzle in a first direction and a position of the second nozzle in the first direction being different from each other,

• the print executor being configured to perform a printing by repeatedly executing a partial printing and a medium conveyance, the partial printing including forming a dot on a print medium by the head while performing a head movement of moving the head relative to the print medium in the first direction or in a second direction opposite to the first direction, the medium conveyance including conveying the print medium relative to the head in a medium conveyance direction crossing the first direction,
• the program causing the controller to execute:
• an image obtaining processing of obtaining an object image data indicating an object image;
• a direction determining processing of determining, based on the object image data indicating the object image, a direction of the head movement in each of a plurality of times of the partial printing including a first partial printing and a second partial printing to be executed after the first partial printing to be the first direction or the second direction;
• and
• a print control processing of causing the print executor to print the object image by causing the print executor to execute the plurality of times of the partial printing based on the object image data, the direction of the head movement in each of the plurality of times of the partial printing being the direction determined by the direction determining processing, wherein;
• the object image includes a first partial image to be printed by the first partial printing, a second partial image to be printed by the second partial printing, and an intermediate image positioned between the first partial image and the second partial image, the intermediate image being to be printed by both of the first partial printing and the second partial printing;
• the direction determining processing including:
• determining whether a specified condition including at least a first condition is satisfied, the first condition indicating that color difference pixels are present in both of the first partial image and the intermediate image, as well as the color difference pixels are present in both of the second partial image and the intermediate image;
• determining the direction of the head movement in the first partial printing and the direction of the head movement in the second partial printing to be same as each other in a case that the specified condition is satisfied, and determining the direction of the head movement in the second partial printing to be opposite to the direction of the head movement in the first partial printing in a case that the specified condition is not satisfied,
• each of the color difference pixels is a pixel having larger difference between a color printed by the partial printing while moving the head in the first direction and a color printed by the partial printing while moving the head in the second direction, compared to pixel different from the color difference pixels.

A method for a print executor having a head, the head including a first nozzle configured to discharge a first ink and a second nozzle configured to discharge a second ink, a kind of the first ink and a kind of the second ink being different from each other, a position of the first nozzle in a first direction and a position of the second nozzle in the first direction being different from each other,

• the print executor being configured to perform a printing by repeatedly executing a partial printing and a medium conveyance, the partial printing including forming a dot on a print medium by the head while performing a head movement of moving the head relative to the print medium in the first direction or in a second direction opposite to the first direction, the medium conveyance including conveying the print medium relative to the head in a medium conveyance direction crossing the first direction,
• the method comprising:
• obtaining an object image data indicating an object image;
• determining, based on the object image data indicating the object image, a direction of the head movement in each of a plurality of times of the partial printing including a first partial printing and a second partial printing to be executed after the first partial printing to be the first direction or the second direction;
• and
• causing the print executor to print the object image by causing the print executor to execute the plurality of times of the partial printing based on the object image data, the direction of the head movement in each of the plurality of times of the partial printing being the direction determined by the determining of the direction of the head movement, wherein;
• the object image includes a first partial image to be printed by the first partial printing, a second partial image to be printed by the second partial printing, and an intermediate image positioned between the first partial image and the second partial image, the intermediate image being to be printed by both of the first partial printing and the second partial printing;
• the determining of the direction of the head movement including:
• determining whether a specified condition including at least a first condition is satisfied, the first condition indicating that color difference pixels are present in both of the first partial image and the intermediate image, as well as the color difference pixels are present in both of the second partial image and the intermediate image;
• determining the direction of the head movement in the first partial printing and the direction of the head movement in the second partial printing to be same as each other in a case that the specified condition is satisfied, and determining the direction of the head movement in the second partial printing to be opposite to the direction of the head movement in the first partial printing in a case that the specified condition is not satisfied,
• each of the color difference pixels is a pixel having larger difference between a color printed by the partial printing while moving the head in the first direction and a color printed by the partial printing while moving the head in the second direction, compared to pixel different from the color difference pixels.