Method and apparatus for controlling ink-jet color printing head

Details Method and apparatus for controlling ink-jet color printing head Method and apparatus for controlling ink-jet color printing head

1986-06-03

1987-07-14

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346 11, 358283, 358298, G01D 1518, H04N 140, H04N 123

Patent

active

046805966

ABSTRACT:
Method and apparatus are provided for controlling a group of ink-jet printing heads to selectively apply (or not apply) dots of one color and of substantially 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 whenever a color density signal of the integral value appears. 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.

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