Patent ID: 7760397

Claim:
A method of controlling a printing apparatus, the printing apparatus capable of applying to a print sheet a colorant of each of a plurality of primary colors, comprising: the apparatus outputting a print sheet forming a test print, the test print comprising a first primary strip corresponding to a single primary color producible by the apparatus extending a length in a direction corresponding to a cross-process direction of the printer, and a set of test patches; reading the test print, the reading including measuring actual colors of each of a plurality of portions of the primary strip along the cross-process direction; isolating cross-process variance of the single primary color of the first primary strip based on said measurement by: calculating correction values for the primary color, at different locations along the cross-process direction, based on an algorithm that takes into account the difference between the measured color and a target color value of the primary color at each of the locations along the cross-process direction; and calibrating the printing apparatus for subsequent prints so as to adjust the color of said prints corresponding to the primary color using said correction values.