Ink jet printing apparatus and printing position setting method of the apparatus

A printing position setting method of an inkjet printing apparatus which prints by scanning an inkjet printhead for discharging ink and a printing medium relative to each other, the printhead comprising a first nozzle group used to print a dot having a first density, and a second nozzle group used to print a dot having a second density, and also having a plurality of nozzle groups, and which has a first printing mode in which only one of the first and second nozzle groups is used during one printing scan, and a second printing mode in which the first and second nozzle groups are driven at different timings during one printing scan, comprising:

• a pattern printing step of printing a pattern for adjusting relative printing positions of the plurality of nozzle rows when printing is to be performed in the first printing mode;
• a specification step of specifying set values of the relative printing positions in the first printing mode from the pattern;
• and
• a determination step of determining, on the basis of the specified set values, set values of relative printing positions of the plurality of nozzle rows in the second printing mode.

A computer program for allowing a computer to implement a printing position setting method of an inkjet printing apparatus which prints by scanning an inkjet printhead for discharging ink and a printing medium relative to each other, said printhead comprising a first nozzle group used to print a dot having a first density, and a second nozzle group used to print a dot having a second density, and also having a plurality of nozzle groups, and which has a first printing mode in which only one of said first and second nozzle groups is used during one printing scan, and a second printing mode in which said first and second nozzle groups are driven at different timings during one printing scan, comprising program codes corresponding to:

• a pattern printing step of printing a pattern for adjusting relative printing positions of said plurality of nozzle rows when printing is to be performed in the first printing mode;
• a specification step of specifying set values of the relative printing positions in the first printing mode from the pattern;
• and
• a determination step of determining, on the basis of the specified set values, set values of relative printing positions of said plurality of nozzle rows in the second printing mode.

A storage medium storing a computer program for allowing a computer to implement a printing position setting method of an inkjet printing apparatus which prints by scanning an inkjet printhead for discharging ink and a printing medium relative to each other, said printhead comprising a first nozzle group used to print a dot having a first density, and a second nozzle group used to print a dot having a second density, and also having a plurality of nozzle groups, and which has a first printing mode in which only one of said first and second nozzle groups is used during one printing scan, and a second printing mode in which said first and second nozzle groups are driven at different timings during one printing scan, storing program codes corresponding to:

• a pattern printing step of printing a pattern for adjusting relative printing positions of said plurality of nozzle rows when printing is to be performed in the first printing mode;
• a specification step of specifying set values of the relative printing positions in the first printing mode from the pattern;
• and
• a determination step of determining, on the basis of the specified set values, set values of relative printing positions of said plurality of nozzle rows in the second printing mode.