To adequately control a distribution of color and ink in color conversion processing.
A first color conversion correction coefficient acquiring portion 330 detects a UCR ratio based on an input color signal D3i. A preceding color conversion portion 310 converts the input color signal D3i into a device independent Lab signal. A subsequent color conversion portion 320 strikes a balance between ink components and color components except the ink components by converting into an output device dependent output color signal D3o by referring to the UCR ratio detected by the first color conversion correction coefficient acquiring portion 330. A second conversion correction coefficient acquiring portion 360 calculates a pure color ratio based on the input color signal D3i. A pure color correction processing portion 380 generates a correction output color signal D3om by correcting the output device dependent output color signal D3o after the color conversion processing by the subsequent color conversion portion 320 by using the pure color ratio obtained by the second color conversion correction coefficient acquiring portion 360. At this time, by controlling the pure color ratio according to a coverage of a single signal of the input color signal D3i, a rapid discoloration is controlled.
HASEGAWA NORIKO
ITO AKIHIRO
