Patent ID: 8294954

Claim:
An image forming apparatus comprising: a plurality of reading units that separately and concurrently read a front side of a document and a back side of the document thereby acquiring image data; a first calculating unit that calculates a first image processing parameter to reduce a difference in image qualities between the image data read by the reading units based on a reading characteristic of the reading unit that has read the image data; a first image processing unit that sets the first image processing parameter and performs image processing on the image data based on the first image processing parameter thereby obtaining processed data; a storing unit that stores therein the processed data with reading-unit information indicating the reading unit that has read the image data corresponding to the processed data; a second calculating unit that calculates a second image processing parameter to reduce a difference in image qualities between the image data read by the reading units based on a reading characteristic of the reading unit indicated by the reading-unit information stored with the image processed data and a writing characteristic of a writing unit when the processed data stored in the storing unit is to be printed by the writing unit; a second image processing unit that sets the second image processing parameter and performs image processing on the processed data stored in the storing unit based on the second image processing parameter thereby obtaining printing data; and a printing unit that causes the writing unit to print the printing data.