A color-processing device includes a storage section which stores reference data including reference values set for respective representative color values selected within the range of a predetermined number of gradations of a predetermined color for each of representative output parts selected from a predetermined number of output parts, a first specifying section which specifies an output part corresponding to the input value, a second specifying section which specifies a representative output part corresponding to the specified output part, a third specifying section which specifies a representative color value corresponding to a color value indicated by the input value, an obtaining section which obtains reference values corresponding to combinations of the specified representative output part and representative color value, and a calculating section which calculates an output value corresponding to the input value by interpolation using the obtained reference values.