Patent ID: 8727474

Claim:
An inkjet printer comprising: a head in which a plurality of outlet rows, each having outlets arranged in an arrangement direction, are arranged in a direction perpendicular to said arrangement direction; a scanning mechanism that moves a base material relative to said head in a scanning direction that intersects with said arrangement direction; a control part that controls ink ejection from said head so that a plurality of outlets of said head form dots at a plurality of positions in a width direction on a base material, said width direction being perpendicular to said scanning direction, outlets that are adjacent to each other in each outlet row having disposed therebetween one outlet from each of the other outlet rows with respect to said width direction; an image pickup part that captures an image printed on a base material; and a correction value acquisition part that acquires a plurality of density correction values of said plurality of outlets, wherein, under control of said control part, a pattern for density correction that indicates a constant-density image is printed on a base material with said plurality of outlets, said image pickup part acquires image data that indicates said pattern for density correction on said base material, and said correction value acquisition part includes: a target outlet detection part that detects a target outlet based on said image data, said target outlet being an outlet that ejects ink toward a linear region that extends in said scanning direction and has a missing part in said pattern for density correction on said base material; a reference outlet specification part that specifies at least one reference outlet that is an outlet included in the same outlet row as said target outlet and located close to said target outlet; and a correction value calculation part that obtains said plurality of density correction values that are used by said control part to control ink ejection from said head by replacing a density correction value of said target outlet among density correction values that are acquired based on a density profile with a representative value of a density correction value of said at least one reference outlet, said density profile indicating a change in density values in said width direction in said density correction pattern, or obtains said plurality of density correction values that are used by said control part to control ink ejection from said head, based on a density profile that is obtained by replacing a density value of said linear region with a representative value of a density value at a position in said width direction at which said at least one reference outlet ejects ink.