Printing apparatus, correction value calculating method, and storage medium

A correction value calculating method comprising:

• (a) printing a pattern based on an instruction gray scale value indicating a predetermined density by a printing apparatus, which performs the printing by ejecting ink from nozzles and forming dot lines in an intersection direction intersecting a predetermined direction, while moving nozzle lines in which the nozzles ejecting the ink on a medium are lined up in the predetermined direction and the medium relatively in the intersection direction;
• (b) acquiring a read gray scale value, which is a result obtained when a scanner reads the pattern, for each line area which is an area in which the dot line is formed in the intersection direction on the medium;
• (c) calculating a first correction value, which is a correction value of each line area corresponding to a middle portion of the pattern in the predetermined direction, based on the read gray scale value of each line area corresponding to the middle portion of the pattern;
• and
• (d) calculating a second correction value, which is a correction value of the line area corresponding to an end portion of the pattern in the predetermined direction, based on the read gray scale value of the line area in the vicinity of the line area corresponding to the end portion of the pattern.

A recording medium recording a program causing a computer to calculate a correction value for correcting density of an image printed by a printing apparatus,

• wherein the printing apparatus ejects ink from nozzles and forms dot lines in an intersection direction intersecting a predetermined direction, while moving nozzle lines in which the nozzles ejecting the ink on a medium are lined up in the predetermined direction and the medium relatively in the intersection direction, and
• wherein the program causes the computer to execute the functions of:
• (a) printing a pattern based on an instruction gray scale value indicating a predetermined density by the printing apparatus;
• (b) acquiring a read gray scale value, which is a result obtained when a scanner reads the pattern, for each line area which is an area in which the dot line is formed in the intersection direction on the medium;
• (c) calculating a first correction value, which is a correction value of each line area corresponding to a middle portion of the pattern in the predetermined direction, based on the read gray scale value of each line area corresponding to the middle portion of the pattern;
• and
• (d) calculating a second correction value, which is a correction value of the line area corresponding to an end portion of the pattern in the predetermined direction, based on the read gray scale value of the line area in the vicinity of the line area corresponding to the end portion of the pattern.