Patent ID: 8902465

Claim:
An image forming apparatus comprising: an image forming unit that forms, on a recording material, a patch image to be used to detect color unevenness by executing an image forming process including a plurality of processes; a colorimetry unit that performs colorimetry of the patch image formed on the recording material at a spatial resolution corresponding to a spatial frequency of color unevenness caused by a specific process included in the image forming process, thereby obtaining a colorimetric value; a detection unit that detects that the color unevenness caused by the specific process has occurred in the patch image by comparing a statistic value based on an n-th (n is an integer not less than 2) order central moment of a specific color component of the colorimetric value obtained by said colorimetry unit with a reference value; and an adjustment unit that, when said detection unit detects that the color unevenness caused by the specific process has occurred in the patch image, adjusts an image forming condition concerning the specific process so as to reduce the color unevenness.