Abstract: A method of correcting color shift caused by printing with an imaging system using a first cartridge and a second cartridge different from the first cartridge includes determining individual cartridge characterization data based on each of the first cartridge and the second cartridge individually; determining combined cartridge characterization data that characterizes a usage combination of the first cartridge and the second cartridge; and determining color correction data based on the individual cartridge characterization data and the combined cartridge characterization data.

Abstract: A method, and an apparatus employing the method, of reducing red eye effect from image data having image attributes. In some embodiments, the method includes identifying image data with a first image attribute having characteristics of red eye pixels, determining a centroid of the identified image data having characteristics of red eye pixels, defining a red eye region based on the centroid, and filling each of the pixels in the red eye region with a color determined from an equation relating to a distance between the centroid and each of the pixels.

Abstract: A method for correcting neutral color shift in a production cartridge for use in an imaging system includes determining a colorant increment data based on a standard cartridge neutral variation signature color data and a standard cartridge neutral sensitivity signature color data associated with a standard cartridge, and based on a production cartridge neutral variation signature color data and a production cartridge neutral sensitivity signature color data associated with the production cartridge, and using the colorant increment data to correct the neutral color shift.

Abstract: A method for calibrating a production printing cartridge for use in an imaging system includes the steps of obtaining first standard cartridge signature color data associated with a standard printing cartridge and a first substrate, obtaining second standard cartridge signature color data associated with the standard printing cartridge and a second substrate, obtaining first production cartridge signature color data associated with the production printing cartridge and the first substrate, and estimating second production cartridge signature color data associated with the production printing cartridge and the second substrate based on the first standard cartridge signature color data, the second standard cartridge signature color data, and the first production cartridge signature color data.

Abstract: A method for correcting color shift in an imaging system, including an imaging object, and a standard color conversion lookup table associated with the imaging object, includes measuring a plurality of test patches to obtain color data associated with the imaging object. A signature color data lookup table is generated, based on the color data, and is combined with the standard color conversion lookup table to generate a composite color conversion lookup table for use with the imaging object.

Abstract: A method of gamut mapping includes the steps of defining a mapping function establishing a continuous first derivative of change of at least one color space component from a first color gamut to a second color gamut, and applying the function to first color gamut data for the at least one color space component.