1. A method for color correcting a color image to account for color vision characteristics associated with a set of target observers in preparation for displaying the color image on a color display device having a plurality of device color primaries, at least one of the device color primaries being a narrow-band primary, comprising: receiving an input color image in an input color space, the input color image being adapted for display on a reference color display device having a plurality of input color primaries having associated input color primary spectra; using a data processing system to apply a metamerism correction transform to the input color image to determine an output color image in an output color space appropriate for display on the color display device, the output color image having a plurality of output color channels, each of the output color channels being associated with one of the device color primaries, wherein the metamerism correction transform modifies colorimetry associated with the input colors to provide output color values such that an average observer metameric failure is reduced for a distribution of target observers that includes a plurality of target observers who are simultaneously viewing the color display device, the plurality of target observers having disparate color vision characteristics; and storing the output color image in a processor accessible memory; wherein the metamerism correction transform is determined by: defining a set of input color values in the input color space; determining a corresponding set of output color values in the output color space such that CIE colorimetry determined for the input color values displayed using the input color primaries substantially matches CIE colorimetry determined for the corresponding output color values displayed using the device color primaries; for each input color value determining a distribution of perceived color difference corresponding to the distribution of target observers, wherein the perceived color difference for a particular target observer represents a difference between a color appearance of the input color value displayed using the input color primaries and a color appearance of the corresponding output color value displayed using the device color primaries; determining a set of corrected output color values corresponding to the set of input color values, wherein each corrected output color value is determined according to the distribution of perceived color differences; and forming the metamerism correction transform responsive to the set of input color values and the corresponding set of corrected output color values.