Patent ID: 7660013

Claim:
A method of converting a first recipe using a first colorant set to a second recipe using a second colorant set in a digital color proofer system wherein a recipe is a data file defining a color and including at least a set of colorant values of a colorant set, comprising the steps of: converting the first recipe into a CIE_Lab (Commission Internationale de l'Éclairage L*a*b*) estimate for the digital color proofer system using a first model and a first database comprising at least one page defined as an array of data points containing at least one first recipe; converting the CIE_Lab estimate into the second recipe in the digital color proofer system using a second model and a second database wherein the second database comprises at least one page defined as a second array of data points with a determined center of the second array and surface points from the second database wherein at least one second recipe corresponds to the first recipe; calculating an accuracy estimate for the at least one second recipe in the second database, the accuracy estimate including the steps of; computing a gamut error representing a difference between a first color represented by a first recipe of the first set of colorants and the center of the at least one second array of data points and the value of the difference from the center of the at least one second array to the closest of the surface points of the second array; and computing a random error including at least one of the steps of; determining a model error in conversions of a first recipe to a CIE_Lab representation, determining a second model error in conversion of a CIE Lab estimate to the second recipe, obtaining a system error in the color conversion process, and rounding errors in settings of colorant values, selecting a second recipe having a maximum accuracy estimate from the at least one second recipe in the second database; and providing the second recipe and the accuracy estimate to a user and storing the second recipe and the accuracy estimate.