Patent ID: 8152262

Claim:
An apparatus for printing on a print medium as said print medium advances along a selected path, said apparatus comprising: a print material delivery assembly including: a source of print material; at least one print device with each print device coupled to said source of print material and each print device having at least one nozzle through which to controllably emit at least one droplet of said print material with said print material delivery assembly oriented to deposit droplets of a print material on at least a portion of said print medium a plurality of times; a print firing controller to generate a print firing signal for each, and coupled to, said at least one nozzle of each of said at least one print device to selectively cause said droplets of print material to be deposited onto said print medium; and correction factors and substantially uncorrelated print masks integrated with said print firing controller with said correction factors utilized to achieve the desired density of droplets on said print medium with said uncorrelated print masks to independently adjust each print firing signal as each droplet is deposited on a same or a nominally offset position of said print medium; wherein said correction factors and uncorrelated masks minimize the visual perception of imperfect dot placement accuracy where the position of one droplet of print material is nominally offset from the position of a predecessor droplet.