1. A method for producing an output color image in an image forming device, comprising: obtaining an input color image; at least one of, adding color rendition dictionaries to, deleting color rendition dictionaries from, or modifying color rendition dictionaries in, a plurality of color rendition dictionaries stored in the image forming device based on input from a user; selecting a color rendition dictionary from among the plurality of color rendition dictionaries; setting setpoint values for a plurality of process parameters in the image forming device based on the selected color rendition dictionary; and producing an output color image using the image forming device in which the setpoint values have been set, wherein the plurality of stored color rendition dictionaries includes at least one color rendition dictionary which is usable to produce a non-standard gamut color in the produced output color image.