Patent ID: 8902467

Claim:
A color conversion device comprising: a non-basic-color value determiner that determines a value of a non-basic color that is different from a corresponding basic color of a plurality of basic colors on the basis of a maximum non-basic-color value, a first non-basic-color limit rate, and a second non-basic-color limit rate of the non-basic color, the value of the non-basic color being determined so as to be used in an image forming unit that forms an image by using a colorants of the basic colors and a colorant of the non-basic color, the maximum non-basic-color value being a maximum value for the non-basic color that can be used relative to an input value of the corresponding basic color in an input image signal having the corresponding basic color as an element, the first non-basic-color limit rate being set relative to the input value of the basic color that corresponds to the non-basic color and indicating a rate that limits the use of the non-basic color relative to the maximum non-basic-color value, the second non-basic-color limit rate being set relative to a total input value of the plurality of basic colors and indicating a rate that limits the use of the non-basic color relative to the maximum non-basic-color value; and a basic-color value determiner that determines a value of each of the plurality of basic colors to be used in the image forming unit on the basis of the value of the non-basic color determined by the non-basic-color value determiner, wherein the input image signal having the plurality of basic colors as elements is converted into an output image signal having the non-basic color and the plurality of basic colors as elements by using the values determined by the non-basic-color value determiner and the basic-color value determiner.