Printing apparatus, control method, and storage medium

A control method for a printing apparatus including

• a printing unit having a first ejection port array in which ejection ports for ejecting a color material ink are arrayed along a sub-scanning direction, and a second ejection port array in which ejection ports for ejecting a reaction liquid are arrayed along the sub-scanning direction, and
• a control unit configured to execute multipass printing to print an image in a predetermined region on a printing medium by scanning the printing unit N times (N is an integer equal to or greater than 2) in a main scanning direction intersecting the sub scanning direction,
• the control method comprising:
• causing the control unit to perform control so that, in a case where an application amount of the color material ink per unit area corresponding to the predetermined region on the printing medium is a first amount, a first ratio of an application amount of the color material ink for printing in last N/2 scans to an application amount of the color material ink for printing in first N/2 scans among the N scans for printing an image is greater than 1, and, in a case where the application amount of the color material ink per unit area corresponding to the predetermined region on the printing medium is a second amount larger than the first amount, a second ratio of the application amount of the color material ink for printing in the last N/2 scans to the application amount of the color material ink for printing in the first N/2 scans among the N scans for printing an image is equal to or greater than 1 and smaller than the first ratio.

A non-transitory computer readable storage medium storing a program for causing a computer to execute a control method for a printing apparatus including a printing unit having a first ejection port array in which ejection ports for ejecting a color material ink are arrayed along a sub-scanning direction, and a second ejection port array in which ejection ports for ejecting a reaction liquid are arrayed along the sub-scanning direction, and a control unit configured to execute multipass printing to print an image in a predetermined region on a printing medium by scanning the printing unit N times (N is an integer equal to or greater than 2) in a main scanning direction intersecting the sub scanning direction,

• the control method comprising:
• causing the control unit to perform control so that, in a case where an application amount of the color material ink per unit area corresponding to the predetermined region on the printing medium is a first amount, a first ratio of an application amount of the color material ink for printing in last N/2 scans to an application amount of the color material ink for printing in first N/2 scans among the N scans for printing an image is greater than 1, and, in a case where the application amount of the color material ink per unit area corresponding to the predetermined region on the printing medium is a second amount larger than the first amount, a second ratio of the application amount of the color material ink for printing in the last N/2 scans to the application amount of the color material ink for printing in the first N/2 scans among the N scans for printing an image is equal to or greater than 1 and smaller than the first ratio.