B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
101/96.02
B41J 2/21 (2006.01) H04N 1/405 (2006.01) H04N 1/52 (2006.01)
Patent
CA 1248818
-21- METHOD AND APPARATUS FOR CONTROLLING INK-JET COLOR PRINTING HEADS ABSTRACT Method and apparatus are provided for control- ling a group of ink-jet printing heads to selectively apply (or not apply) dots of one color and of substan- tially fixed size in random dot pattern arrangements to dot positions of a plurality of pixel areas located sequentially along a line scanned by the printing heads. A sequential series of F integral value color image density signals representative of the tone value at which a respective one of the pixel areas is to be printed by the colored dots is produced. A number of different dot pattern arrangements are listed in a table for the F integral values to produce the tone value representative of a density signal of such an integral value. One of the dot pattern arrangements is randomly selected when- ever a color density signal of the integral value ap- pears. The group of ink-jet heads apply colored dots onto the dot positions of the associated pixel area in accordance with the pattern randomly selected.
487229
Metromedia Company A. Partnership
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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