Patent ID: 9575429
Date: 2017-02-21
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an acquisition unit configured to divide an image, which an image forming unit generates, into density regions, to cause the image forming unit to form a patch for gray to be formed with toners of cyan, magenta, and yellow (CMY) for each of the density regions, and to acquire a chromaticity value with respect to the patch for gray; a determination unit configured to determine whether a chroma value obtained from the chromaticity value of the patch for gray for each density region acquired by the acquisition unit is equal to or greater than a threshold value; and a generation unit configured to generate, for a first density region corresponding to a patch with respect to which a chroma value determined by the determination unit to be less than the threshold value is obtained, using the obtained chroma value, a first correction value used to decrease the chroma value, and configured to generate, for a second density region corresponding to a patch with respect to which a chroma value determined by the determination unit to be equal to or greater than the threshold value is obtained, a second correction value by performing interpolation calculation based on the first correction value generated for the first density region and predetermined approximations.