Patent ID: 9704073
Date: 2017-07-11
CPC Classifications: G06K,H04N

Claim:
1. An image-forming apparatus comprising: a printer that prints a color reproduction image; a storage section that stores a four or more dimensional look-up table specifying a correspondence relationship between an used amount of a first color material with four or more colors and an used amount of a second color material with colors equal to or more than the colors of the first color material, with the colors of the first color material being used for a formation of a printing material in a printing device, with the colors of the second color material being used for printing of the color reproduction image in the printer, with the correspondence relationship of the four or more dimensional look-up table indicating both a first output characteristic for a first region that is defined by a first set of the colors of the first color material in the four or more dimensional look-up table, and a second output characteristic, which is different from the first output characteristic, for a second region, which is different from the first region and defined by a second set of the colors of the first color material in the four or more dimensional look-up table; and a central processing unit that performs a color conversion in reference to the four or more dimensional look-up table stored in the storage section, the printer printing the color reproduction image with the second color material according to the color conversion by the central processing unit, the first output characteristic for the first region and the second output characteristic for the second region having different values, the first output characteristic includes an output characteristic in which a first color difference between a color value of the first color material and a color value of the second color material under a first observation light source is within a first range for all of the first region, and a second color difference between a color value of the first color material and a color value of the second color material under a second observation light source, which is different from the first observation light source, is outside a second range, which is different from the first range, for at least part of the first region, and the second output characteristic includes an output characteristic in which the first color difference is outside the first range for at least part of the second region, and the second color difference is within the second range for all of the second region.