Printing apparatus and method of processing printing data

A printing apparatus comprising a driving unit configured to drive a printhead including two or more nozzle substrates on each of which a plurality of nozzles are arranged such that each nozzle of the printhead prints a dot on a printing medium, and a conveying unit configured to convey the printing medium,

• wherein on each of the nozzle substrate, the plurality of nozzles are arranged such that nozzles for printing dots of the same color form two or more nozzle arrays adjacent to each other in parallel,
• the printing apparatus further comprises:
• a memory configured to store printing data;
• and
• a data processing unit configured to perform, for each nozzle substrate,
• a first operation for developing printing data column by column on the memory, and
• a second operation for assigning the printing data on the memory to each nozzle array;
• a controlling unit configured to control the driving unit to print dots on the printing medium by using the nozzles of each nozzle array, based on the assigned printing data,
• wherein, for each nozzle substrate, the data processing unit further performs, after the first operation and before the second operation,
• an operation for specifying, in a case where printing is performed by assigning, to each nozzle array, the printing data of each column developed on the memory by the first operation, a portion of the printing data, which corresponds to a dot whose printing position is deviated from a region corresponding to the column of the printing data due to a tilt of the two or more nozzle arrays with respect to a conveyance direction of the printing medium, based on the tilt of the two or more nozzle arrays, and
• an operation for changing, on the memory, the printing data developed on the memory, such that the specified portion is shifted by a column corresponding to the tilt of the two or more nozzle arrays.

A method for processing printing data input to a printing apparatus,

• the printing apparatus comprising:
• a driving unit configured to drive a printhead including a plurality of nozzles such that each nozzle of the printhead prints a dot on a printing medium;
• a conveying unit configured to convey the printing medium;
• and
• a memory configured to store printing data, and
• the plurality of nozzles being arranged such that nozzles for printing dots of the same color form two or more nozzle arrays adjacent to each other in parallel,
• the method for processing printing data comprising:
• developing printing data column by column on the memory;
• assigning the printing data on the memory to each nozzle array;
• and
• controlling the driving unit to print dots on the printing medium by using the nozzles of each nozzle array, based on the assigned printing data, and
• the method for processing printing data further comprising, after the developing and the assigning:
• specifying, in a case where printing is performed by assigning, to each nozzle array, the printing data of each column developed on the memory in the developing, a portion of the printing data, which corresponds to a dot whose printing position is deviated from a region corresponding to the column of the printing data due to a tilt of the two or more nozzle arrays with respect to a conveyance direction of the printing medium, based on the tilt of the two or more nozzle arrays;
• and
• changing, on the memory, the printing data developed on the memory, such that the specified portion is shifted by a column corresponding to the tilt of the two or more nozzle arrays.