Image processing apparatus and image processing method adapted to correct color unevenness

An image processing apparatus comprising:

• a detection unit that detects color unevenness of an image according to a plurality of halftone screening conditions;
• a correction amount calculation unit that calculates a correction amount corresponding to the color unevenness detected by the detection unit;
• a correction amount division unit that divides the correction amount into common information which is common among the halftone screening conditions, and a dependent information which is dependent on the respective halftone screening conditions;
• a storage unit that stores the common information and the dependent information;
• a correction unit that corrects the image according to the correction amount stored in the storage unit.

An image processing apparatus comprising:

• a print unit that prints an image on a recording medium according to a plurality of halftone screening conditions;
• a detection unit that detects color unevenness of the image printed by the print unit;
• a correction amount calculation unit that calculates a correction amount corresponding to color unevenness detected by the detection unit;
• a correction amount division unit that divides the correction amount calculated by the correction amount calculation unit into common information, which is common among the halftone screening conditions, and dependent information, which is dependent on the respective halftone screening conditions;
• a storage unit that stores the common information and the dependent information;
• and
• a control unit that controls the print unit to print the image based on the correction amount stored in the storage unit.

An image processing method comprising:

• storing a correction amount used to correct color unevenness of an image according to a plurality of halftone screening conditions;
• and
• correcting an input image according to the stored correction amount;
• wherein the correction amount includes common information, which is common among the halftone screening conditions, and dependent information, which is dependent on the respective halftone screening conditions, and
• wherein the stored correction amount includes a density difference table including common information which represents each density difference between a corresponding predetermined density and a corresponding corrected density, and a coefficient table including the dependent information, which represents each coefficient for the corresponding density difference and is used to correct the color unevenness which is dependent on the respective halftone screening conditions.

An image processing apparatus comprising:

• a storage unit that stores a correction amount used to correct color unevenness of an image;
• and
• a correction unit that corrects an input image according to the correction amounts stored in the storage unit;
• wherein the correction amount comprises a density correction amount which is common among a plurality of halftone screening conditions, the density correction amount corresponding to positions in a main scanning direction, and a density correction amount which is not common among the plurality of the halftone screening conditions.