Printer, non-transitory storage medium storing plurality of instructions, and control method

A non-transitory storage medium storing a plurality of instructions readable by a computer of a printer, the printer including a print head having a plurality of nozzles arranged in a first direction and configured to discharge ink, a first moving device configured to execute main scanning of moving the print head relatively with respect to a printing medium in a second direction intersecting the first direction, and a second moving device configured to execute sub scanning of moving the printing medium relatively with respect to the print head in the first direction,

• wherein, when executed by the computer, the plurality of instructions cause the printer to:
• obtain object image data of an object image including a code image having a first area and a second area, brightness of which is different from brightness of the first area, the code image representing information by the first area and the second area;
• specify the code image included in the object image;
• generate dot data, by using the object image data, in which each of a plurality of pixels has information representing dot forming states of the ink;
• and
• control the printing device to execute partial printing and the main scanning a plurality of times respectively so as to print the object image on the printing medium, the partial printing being printing in which a plurality of dots are formed on the printing medium based on the dot data by discharging the ink from the print head while the main scanning is executed,
• wherein a plurality of print target areas includes a first print target area and a second print target area which are two print target areas adjacent to each other in the first direction and overlapping to each other, the plurality of print target areas respectively corresponding to the plurality of times of the partial printing on the printing medium,
• wherein, when executed by the computer, the plurality of instructions cause the printer to:
• generate first partial-dot-data of the dot data by executing a first generating process with respect to first partial-image data of the object image data, the first partial-image-data corresponding to a first partial-image that is an image positioned within a non-overlapping area that is an area except for an overlapping area in a total area of the first print target area and the second print target area, the overlapping area being an area where the first print target area and the second print target area overlap to each other, and
• generate second partial-dot-data of the dot data by executing a second generating process with respect to second partial-image-data of the object image data, the second partial-image-data corresponding to a second partial-image that is an image positioned within the overlapping area, the second generating process being a process of reducing density of a partial-image represented by partial-dot-data, a degree of reduction of the partial-image in density by the first generating process is equal to or less than a degree of reduction of the partial image in density the second generating process, and
• wherein, when executed by the computer, the plurality of instructions cause the printer to, in the second generating process, determine a degree of reduction in density by the second generating process to a first degree of reduction in a first case where a particular condition including a code condition that is satisfied when the second partial-image includes at least a portion of the code image is satisfied, and determine the degree of reduction in density by the second generating process to a second degree of reduction that is different from the first degree of reduction in a second case where the second partial-image does not include the code image.

A control method for controlling a printer, the printer including a print head having a plurality of nozzles arranged in a first direction and configured to discharge ink, a first moving device configured to execute main scanning of moving the print head relatively with respect to a printing medium in a second direction intersecting the first direction, and a second moving device configured to execute sub scanning of moving the printing medium relatively with respect to the print head in the first direction, the control method comprising the steps of:

• obtaining object image data of an object image including a code image having a first area and a second area, brightness of which is different from brightness of the first area, the code image representing information by the first area and the second area;
• specifying the code image included in the object image;
• generating dot data, by using the object image data, in which each of a plurality of pixels has information representing dot forming states of the ink;
• and
• controlling the printing device to execute partial printing and the main scanning a plurality of times respectively so as to print the object image on the printing medium, the partial printing being printing in which a plurality of dots are formed on the printing medium based on the dot data by discharging the ink from the print head while the main scanning is executed,
• wherein a plurality of print target areas includes a first print target area and a second print target area which are two print target areas adjacent to each other in the first direction and overlapping to each other, the plurality of print target areas respectively corresponding to the plurality of times of the partial printing on the printing medium,
• wherein the control method includes the steps of:
• generating first partial-dot-data of the dot data by executing a first generating process with respect to first partial-image data of the object image data, the first partial-image-data corresponding to a first partial-image that is an image positioned within a non-overlapping area that is an area except for an overlapping area in a total area of the first print target area and the second print target area, the overlapping area being an area where the first print target area and the second print target area overlap to each other, and
• generating second partial-dot-data of the dot data by executing a second generating process with respect to second partial-image-data of the object image data, the second partial-image-data corresponding to a second partial-image that is an image positioned within the overlapping area, the second generating process being a process of reducing density of a partial-image represented by partial-dot-data, a degree of reduction of the partial-image in density by the first generating process is equal to or less than a degree of reduction of the partial-image in density by the second generating process, and
• wherein, in the second generating process, a degree of reduction in density by the second generating process is determined to a first degree of reduction in a first case where a particular condition including a code condition that is satisfied when the second partial-image includes at least a portion of the code image is satisfied, and the degree of reduction in density by the second generating process is determined to a second degree of reduction that is different from the first degree of reduction in a second case where the second partial-image does not include the code image.