Patent ID: 8824006

Claim:
A color correction apparatus comprising: an input portion that inputs color image signals which correspond to recording color material amounts; a storing portion that stores a standard color reproduction parameter for calculating a standard color reproduction chromaticity and reference chromaticity deviation amounts at a plurality of reference color points in recording color material amount coordinate space; and a correction portion that corrects the input color image signals by estimating the chromaticity deviation amounts of the input color image signals on the basis of the reference chromaticity deviation amounts, and by calculating the standard chromaticity which corresponds to the input color image signals on the basis of the standard color reproduction parameter, and on the basis of the estimated chromaticity deviation amounts and the standard chromaticity, wherein the correction portion calculates a reproduction chromaticity which corresponds to the input color image signals on the basis of the estimated chromaticity deviation amounts and the standard chromaticity, calculates a matrix which represents the relationship of chromaticity change amounts and color material correction amounts in neighboring regions in the recording color material amount coordinate space of the input color image signals on the basis of the reproduction chromaticity and the input color image signals, calculates the color material correction amounts with respect to the input color image signals on the basis of the estimated chromaticity deviation amounts and the matrix, and calculates corrected color image signals on the basis of the input color image signals and the color material correction amounts, and calculates the corrected color signals by estimating the chromaticity deviation amounts for each head block when an image is formed by a head block row configured of a plurality of head blocks including a plurality of heads which correspond to a plurality of colors.