Patent ID: 7933053
Filing Date: 2011-04-26
Classification: H04N

Abstract:
1. A method for updating a spot color dictionary of spot color recipes associated with a document processing system, the method comprising: determining, for each respective spot color of interest of the spot color dictionary, a respective localized model of a color production behavior of the document processing system, wherein each respective localized model is determined based on a weighted evaluation of the color production behavior of the document processing system, wherein data regarding the production of colors that are relatively close in color space to a respective color space position of the respective spot color for which the respective localized model is being determined is given a higher weight than is data regarding the production of colors that are relatively far from the respective color space position of the respective spot color for which the respective model is being determined; transforming, by the document processing system, respective color definition information of each respective spot color, for which a respective localized model is determined, through the respective localized model, thereby determining a respective updated colorant recipe for each respective spot color; and updating respective spot color dictionary entries of the spot color dictionary, for the respective spot colors, according to the respective determined updated colorant recipes; wherein determining, for each respective spot color of interest of the spot color dictionary, a respective localized model of a color production behavior of the document processing system further comprises: producing a respective test patch according to a respective spot color colorant recipe of each selected respective spot color of the spot color dictionary; producing at least one respective perturbation test patch based on a perturbation from the respective spot color recipe or based on a perturbation from a spot color target color measurement value associated with the respective spot color recipe that is transformed through the determined respective localized model; measuring a respective color of each respective test patch and each respective perturbation test patch, thereby determining a respective measured color value for each respective test patch and perturbation test patch; and determining, for each respective spot color of interest of the spot color dictionary, the respective localized model of the color production behavior of the document processing system based on the respective measured color value for each respective test patch and perturbation test patch based on a weighted evaluation of the color production behavior of the document processing system, wherein respective measured color value for each respective test patch and perturbation test patch data regarding the production of colors that are relatively close in color space to a respective color space position of the respective spot color for which the respective localized model is being determined is given a higher weight than is respective measured color value for each respective test patch and perturbation test patch data regarding the production of colors that are relatively far from the respective color space position of the respective spot color for which the respective model is being determined.