Patent ID: 7417768

Claim:
Apparatus for printing a desired image on a printing medium, based upon input image data, by construction from individual marks of at least one colorant, formed in a pixel grid; said apparatus comprising: for each colorant, at least one respective multielement printing array that is subject to mark-intensity errors of individual printing elements, including variations in printed intensity as among said elements of the array; means for measuring mark-intensity errors of the at least one array; means for modifying, without entirely replacing, a preexisting multicolumn, multirow numerical tabulation that defines an intensity correspondence between such input image data and such marks, to compensate for the measured mark-intensity errors; said modifying means and said modified tabulation comprising means for controlling a halftoning stage or other rendition stage of the printing apparatus; wherein said modifying means comprise means for introducing continuous control enabling compensation that is different for different print densities; wherein said halftoning or other rendition stage, prior to final printing preparations and in response to said measuring, enable precise reduction of said intensity variations as among said elements; and means for printing using the modified tabulation.