Color image-processing apparatus

Details Color image-processing apparatus Color image-processing apparatus

1986-10-24

1988-05-17

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358 78, H04N 146

Patent

active

047454679

ABSTRACT:
A color copier comprises a color line-image sensor, a matrix circuit, and a color conversion circuit. The color line-image sensor reads a color document, to output a plurality of fundamental color signals. The matrix circuit converts the fundamental color signals into a brightness signal and two color-difference signals. The color-conversion circuit converts the brightness and color difference signals into ink-amount control signals for controlling the amounts of color inks used in a color printer. In order to decrease the memory capacity of the color conversion circuit and faithfully reproduce dark colors, a nonlinear conversion circuit is provided at the preceding stage of the matrix circuit. The nonlinear conversion circuit is arranged to increase a change in level of an input signal in a low-level range, to an extent greater than that in a high-level range.

REFERENCES:
patent: 4058828 (1977-11-01), Ladd
patent: 4418358 (1983-11-01), Poetsch et al.
patent: 4649423 (1987-03-01), Hoffrichter
patent: 4661843 (1987-04-01), Sekizawa

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