1. A method comprising: identifying a plurality of preferred color values in a destination color space, each preferred color value being one of a set of colorimetrically equivalent color values, the destination color space having color values defined by a particular number of color components; defining intermediate color values in an intermediate color space, the intermediate color values corresponding to the plurality of preferred color values, the intermediate color space having a number of color components that is less than the particular number of color components of the destination color space; identifying a known mapping from the destination color space to a source color space, wherein the source color space differs from the intermediate color space; using the intermediate color values and the known mapping to determine a conversion process for converting source color values to preferred color values in the destination color space; and converting, by operation of a computer, a source color value in the source color space to a preferred color value in the destination color space using the conversion process.