Patent ID: 8395832

Claim:
An image processing apparatus comprising: a major color range detector configured to detect a major color range which is a color range among a plurality of color ranges each formed on a basis of chromaticities of pixels in scanned image data, the major color range containing a largest number of pixels of the color ranges; a criteria density setting unit configured to determine a density value where the largest number of pixels exist in a density histogram of the major color range as a criteria density; a first correction value derivation unit configured to derive a first correction value to correct density values, in a first predetermined range greater than the criteria density, to be closer to the criteria density, based on the density information of the major color range; a second correction value derivation unit configured to derive a second correction value to correct density values, in a second predetermined range less than the criteria density, to be closer to the criteria density based on the density information of the major color range; a correction table derivation unit configured to derive a gradation correction table, based on the first correction value and the second correction value; and a correction unit configured to correct density values in the scanned image data, based on the gradation correction table.