1. A method for converting input data representing a color formed from only two primary colors to output data representing a color in a full color space, comprising the steps of: receiving the two-color input data in the form of two colors, a primary color and a secondary color; mapping each color of the two-color input data to an equivalent color defined in the full color space by applying a first mapping function to each color of the two-color input data; determining, from the two-color input data, a rendering characteristic for each of the primary color and the secondary color; based upon the rendering characteristics, and the primary and secondary colors, representing a combination of the primary and secondary colors, and the associated rendering characteristics, as an intermediate output; and processing the intermediate output using a second function to generate the output data representing a single color defined in the full color space.