Patent ID: 8804217

Claim:
An image forming apparatus comprising: a first reading unit configured to read a pattern image formed on a first printing medium to obtain a first luminance value; a first creation unit configured to convert the first luminance value into a density value using first conversion information and to create an image processing condition based on the density value; a second reading unit configured to read a pattern image formed on an image carrier; a correction unit configured to correct the image processing condition created by the first creation unit based on the pattern image read by the second reading unit; a determination unit configured to form a pattern image on a second printing medium different from the first printing medium using the image processing condition corrected by the correction unit, and to determine second conversion information for converting luminance values into a density value for the second printing medium based on a second luminance value obtained by reading the pattern image on the second printing medium, the first luminance value, and the first conversion information; and a second creation unit configured to convert a luminance value obtained by reading the pattern image formed on the second printing medium into a density value using the determined second conversion information, and to create an image processing condition based on the density value obtained using the determined second conversion information.