Printing apparatus, printing method, and storage medium

A printing method of a printing apparatus that performs printing by ejecting a plurality of inks, whose materials are different from each other, and a reaction liquid, which reacts with the inks so as to prompt solidification of the inks, to a print medium, the printing method comprising;

• a printing step for printing a test pattern, which includes a detection pattern extending in a predetermined direction, wherein the detection pattern divided into two in the predetermined direction includes one area, in which the at least two inks and the reaction liquid are ejected, and the other area, in which only the at least two inks or the at least two inks and the reaction liquid of an amount that is smaller than that of the reaction liquid ejected to the one area are ejected;
• a measurement step for measuring an optical characteristic of the test pattern printed in the printing step;
• an obtainment step for obtaining a displacement amount of an ejection position of the reaction liquid in the predetermined direction, based on the optical characteristic of the test pattern measured in the measurement step;
• and
• a printing step for performing printing with correction of the displacement amount obtained in the obtainment step.

A non-transitory computer readable storage medium storing a program for causing a computer to function as a control apparatus that controls a printing apparatus, the control apparatus comprising:

• a printing unit configured to perform printing by ejecting a plurality of inks, which are different from each other, and a reaction liquid, which reacts with the inks so as to prompt solidification of the inks, to a print medium;
• and
• a measurement unit configured to be capable of measuring an optical characteristic of a print product,
• wherein the printing unit is controlled to print a test pattern, which includes a detection pattern extending in a predetermined direction, and the detection pattern divided into two in the predetermined direction includes one area, in which the at least two inks and the reaction liquid are ejected, and the other area, in which only the at least two inks or the at least two inks and the reaction liquid of an amount that is smaller than that of the reaction liquid ejected to the one area are ejected,
• wherein the measurement unit is controlled to measure an optical characteristic of the printed detection pattern, and
• wherein the displacement amount of an ejection position of the reaction liquid in the predetermined direction is obtained, based on the optical characteristic of the detection pattern.