Patent ID: 8496313

Claim:
An image processing method of creating image data for forming an image on a recording medium by ejecting liquid droplets from a plurality of nozzles of a recording head onto the recording medium while causing relative movement of the recording medium and the recording head, the image processing method comprising: a correction coefficient storage step of determining correction coefficients for ejection failure correction based on difference of landing interference patterns of a plurality of types, according to correspondence information indicating correspondence relationship between the landing interference patterns and the respective nozzles, the landing interference patterns being based on a landing interference inducing factor including a deposition sequence of the liquid droplets on the recording medium that is defined by an arrangement configuration of the plurality of nozzles and a direction of the relative movement, and storing the correction coefficients for ejection failure correction according to the landing interference patterns, in a storage unit; an ejection failure nozzle position information acquisition step of acquiring ejection failure nozzle position information indicating a position of an ejection failure nozzle which cannot be used for forming the image, of the plurality of nozzles; and a correction processing step of performing a correction calculation on input image data using a corresponding correction coefficient obtained by referring to the correction coefficients for ejection failure correction according to the ejection failure nozzle position information, so as to generate image data corrected in such a manner that output of the ejection failure nozzle is compensated by a nozzle other than the ejection failure nozzle.