Methods of gradation control and picture quality improvement in

Details Methods of gradation control and picture quality improvement in Methods of gradation control and picture quality improvement in

1994-12-27

1998-02-24

Reinhart, Mark J.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Gradational recording

B41J 2355, G01D 1510, G01D 1516

Patent

active

057215782

ABSTRACT:
A gradation control method in a color thermal transfer printer is adapted to express one pixel by a dot matrix with two rows and two coles, control a density value of one dot with a time for energizing a heating element of a thermal head, and carry out mask patterning for plotting only one of four dots when the gradation of each color for one pixel is not more than a prescribed value while plotting only two of the four dots when the gradation is in excess of the prescribed value. At this time, employed is a mask pattern of necessarily plotting cyan and magenta on dots which are different from each other. A picture quality improving method in a staggered printing system is adapted to plot a noted dot when at least one of such conditions that density data of the noted dot is in excess of a prescribed density value and that density data of any of four dots most approximate to the noted dot is not more than a prescribed low density value is satisfied, even if the noted dot corresponds to that to be masked.

REFERENCES:
patent: 3230303 (1966-01-01), Macovski et al.
patent: 3922484 (1975-11-01), Keller
patent: 4691211 (1987-09-01), Brownstein
patent: 4974067 (1990-11-01), Suzuki et al.
patent: 5109235 (1992-04-01), Sasaki
patent: 5451985 (1995-09-01), Cho
Patent Abstracts of Japan, vol. 10, No. 21, Sep. 14, 1985.

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