Inkjet printer and image processor for correcting image data based on color specification values and a target color specification value

摘要

In the present invention, a first calculation unit calculates, based on image data obtained by reading with a reading unit a plurality of patches formed on a printing medium by a plurality of nozzle regions constituting nozzle array of a printing head, respective color specification values of a plurality of correction regions corresponding to a plurality of nozzle regions constituting the nozzle array. Then, a target value setting unit sets, based on the calculated color specification values of the plurality of correction regions, a target color specification value of the patch. Further, a second calculation unit calculates a difference between each of the color specification values of the plurality of correction regions and the target color specification value as a correction amount. After that, based on the correction amount calculated, image data corresponding to an image printed by each of the plurality of nozzle regions are corrected.

主权项

1. An inkjet printer for printing an image by ejecting ink, comprising:
a printing head, comprising a first nozzle array and a second nozzle array, wherein the first nozzle array comprises first nozzles arranged in a predetermined direction and constructed to eject a first ink, and the second nozzle array comprises second nozzles arranged in the predetermined direction and constructed to eject a second ink, that is a different color from the first ink; a print control unit constructed to cause the printing head to print:
(i) a first multicolored patch on a first region of a printing medium by ejecting the first ink from at least one of the first nozzles included in a first nozzle group and by ejecting the second ink from at least one of the second nozzles included in a second nozzle group, and(ii) a second multicolored patch on a second region of the printing medium, the second region being different from the first region in the predetermined direction, by ejecting the first ink from at least one of the first nozzles included in a third nozzle group and which is not included in the first nozzle group, and by ejecting the second ink from at least one of the second nozzles included a fourth nozzle group and which is not included in the second nozzle group; an acquisition unit configured to acquire a first measurement value by measuring the first multicolored patch and a second measurement value by measuring the second multicolored patch; a first determination unit configured to determine a target value based on the first and second measurement values; and a second determination unit configured to:
(i) determine first correction parameters for correcting first image data corresponding to a first image to be printed by using the first nozzle group and the second nozzle group based on the first color measurement value and the target value, and(ii) determine second correction parameters for correcting second image data to be printed by using the third nozzle group and the fourth nozzle group based on the second color measurement value and the target value,wherein the first and second correction parameters are parameters for outputting output data that includes a plurality of color components based on input data that includes a plurality of color components.