Method for adjusting inkjet printer, program, and printing system

A program for causing a computer to perform image analysis, the program, wherein

• the computer is caused to perform analysis processing of performing analysis on a pattern image that is an image generated by reading, with a scanner, a predetermined test pattern printed on a medium by an inkjet printer,
• the inkjet printer includes
• a plurality of inkjet heads each having a nozzle row in which a plurality of nozzles are arranged with positions in a predetermined nozzle row direction misaligned from one another,
• a main scan driving unit that causes the plurality of inkjet heads to perform a main scan of ejecting ink while relatively moving with respect to the medium in a main scanning direction set in advance, and
• a drive signal output unit that outputs a drive signal for causing the plurality of inkjet heads to eject ink,
• the main scan driving unit causes the plurality of inkjet heads to perform the main scan based on the control setting value stored in a setting value storage that stores a control setting value, which is a setting value for controlling operation of the inkjet printer,
• the test pattern includes a pattern for ejecting ink from the plurality of nozzle rows to a same position in the main scanning direction and a voltage detection pattern, which is a pattern for detecting a voltage of the drive signal received by each of the plurality of inkjet heads, and
• in the analysis processing,
• the computer is caused to perform
• misalignment amount detection processing of detecting a dot position misalignment amount that is a misalignment amount of a position of the dot occurring in each of the nozzle rows by image processing executed based on the pattern image, for a position of a dot of ink formed on the medium by ejecting ink from the nozzle included in each of the plurality of nozzle rows in the plurality of inkjet heads, and
• correction value calculation processing of calculating, by calculation, a dot position correction value, which is a correction value corresponding to the dot position misalignment amount detected by the misalignment amount detection processing.

A printing system that performs printing with an inkjet method, the printing system comprising:

• an inkjet printer that performs printing with an inkjet method;
• a scanner that performs reading of an image;
• an image analysis apparatus that performs an analysis of an image;
• and
• a setting value storage that stores a control setting value, which is a setting value for controlling operation of the inkjet printer, wherein
• the inkjet printer includes
• a plurality of inkjet heads each having a nozzle row in which a plurality of nozzles are arranged with positions in a predetermined nozzle row direction misaligned from one another,
• a main scan driving unit that causes the plurality of inkjet heads to perform a main scan of ejecting ink while relatively moving with respect to a medium in a main scanning direction set in advance, and
• a drive signal output unit that outputs a drive signal for causing the plurality of inkjet heads to eject ink,
• the main scan driving unit causes the plurality of inkjet heads to perform the main scan based on the control setting value stored in the setting value storage,
• at a time of adjustment for performing adjustment on the inkjet printer,
• the inkjet printer prints a predetermined test pattern on the medium,
• the scanner reads the medium on which the test pattern is printed,
• the image analysis apparatus performs analysis on a pattern image that is an image indicating the test pattern, the image being generated by reading, with the scanner, the medium on which the test pattern is printed,
• the test pattern includes a pattern for ejecting ink from a plurality of the nozzle rows to a same position in the main scanning direction and a voltage detection pattern, which is a pattern for detecting a voltage of the drive signal received by each of the plurality of inkjet heads,
• in analysis processing of performing analysis on the pattern image, the image analysis apparatus performs
• misalignment amount detection processing of detecting a dot position misalignment amount that is a misalignment amount of a position of the dot occurring in each of the nozzle rows by image processing executed based on the pattern image, for a position of a dot of ink formed on the medium by ejecting ink from the nozzle included in each of the plurality of nozzle rows in the plurality of inkjet heads, and
• correction value calculation processing of calculating, by calculation, a dot position correction value, which is a correction value corresponding to the dot position misalignment amount detected by the misalignment amount detection processing, and
• by causing the setting value storage to store the dot position correction value calculated in the correction value calculation processing as at least a part of the control setting value at least a part of the control setting value is updated based on a result of analysis in the analysis processing.