1. A method of characterizing a full color gamut of a digital photosensitive color proofing system having at least two separately controllable process parameters that control color density and tone reproduction of three or more colorants used to produce a color print image from a digital image, the method comprising the steps of: (a) adjusting a first process parameter to produce a plurality of color density test areas, each color density test area having a test patch for each colorant printed at a selected color density that is within a range of color densities capable of being primed by the digital photosensitive color proofing system; (b) adjusting a second process parameter to produce a plurality of tone rendition test areas, one for each of the color density test areas, each tone rendition test area having a plurality of test tints for each colorant as a primary color and a plurality of test patches for a set of secondary colors composed from combinations of the primary colors; (c) printing a single test pattern page, the test pattern page including both the plurality of color density test areas and the plurality of tone rendition test areas; (d) measuring selected ones of the test patches and test tints to characterize the full color gamut in terms of a primary and secondary color gamut and tone renditions for the range of color densities creating measurements; and (e) optimizing the full color gamut using a predetermined model of the relationship of primary colorant to secondary colors.