Patent ID: 9014582
Filing Date: 2015-04-21
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming unit configured to form an image; an extraction unit that analyzes an input print job and extracts a color used in pages more than a threshold value of a plurality of pages constructing the print job; a patch image forming unit configured to form, by the image forming unit, a patch image of the color extracted by the extraction unit; a determining unit configured to measure the patch image formed by the patch image forming unit and to determine an amount of color fluctuation from a reference value for the extracted color; and a correction unit configured, when printing an image included in a page constructing the input print job by the image forming unit, to correct the extracted color by using the amount of color fluctuation determined by the determining unit, wherein a timing at which the patch image is formed by the patch image forming unit and a timing at which the amount of color fluctuation of the extracted color is determined by the determining unit are determined using information about the number of pages of and information about the number of copies of the input print job.