Inkjet printer, inkjet printer controller and method for controlling the inkjet printer

An inkjet printer comprising:

• first ejection means for ejecting ink to a first printing area on a surface of a print medium to form first ink dots in the first printing area;
• second ejection means for ejecting ink to a second printing area on the surface of the print medium to form second ink dots in the second printing area;
• a carriage holding the first and second ejection means and relatively movable along first and second directions with respect to the surface of the print medium, the first and second directions being perpendicular;
• detecting means for detecting first and second printing states in the first and second printing areas, respectively;
• comparing means for comparing the first and second printing states detected by the detecting means;
• ejection controlling means for controlling ejection from the first and second ejection means;
• and
• printing state compensation means for compensating ejection control performed by the ejection controlling means according to a comparison result output by the comparing means so that the first and second printing states are substantially equal.

An inkjet printer controller comprising:

• a detector configured to detect first and second printing states in first and second printing areas, respectively, a first printer head ejecting ink to the first printing area on a surface of a print medium, a second printer head ejecting ink to the second printing area on the surface of the print medium;
• a comparing unit configured to compare the first and second printing states detected by the detector;
• an ejection controller configured to control ejection from the first and second printer heads;
• and
• a printing state compensator configured to compensate ejection control performed by the ejection controller according to a comparison result output by the comparing unit so that the first and second printing states are substantially equal.

A method for controlling an inkjet printer, comprising:

• ejecting ink from a first printer head to a first printing area on a surface of a print medium;
• ejecting ink from a second printer head to a second printing area on the surface of the print medium;
• detecting first and second printing states in the first and second printing areas, respectively;
• comparing the first and second printing states;
• controlling ejection from the first and second printer heads;
• and
• compensating ejection control in the controlling step according to a comparison result in the comparing step so that the first and second printing states are substantially equal.