Color image forming method and apparatus

Details Color image forming method and apparatus Color image forming method and apparatus

1995-01-31

2000-09-12

Lee, Thomas D.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358501, 358529, G03F 308, H04N 146

Patent

active

061185582

ABSTRACT:
When an image from a scanner or an external apparatus is to be printed out, in order to achieve both high color reproducibility and high gray reproducibility, a black signal is extracted from an input color image signal, the ratio of the extracted black signal to the color image signal is changed in accordance with an input instruction, and an output operation is performed in accordance with the extracted black signal and the color image signal. When a color image signal is formed by scanning an image, a black signal is extracted from the color image signal, a high-frequency component of the extracted black signal is removed, and an output operation is performed in accordance with the black signal, from which the high-frequency component is removed, and with the color image signal.

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patent: 4958219 (1990-09-01), Kadowaki
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patent: 5359437 (1994-10-01), Hibi
patent: 5369510 (1994-11-01), Tagughi
patent: 5386305 (1995-01-01), Usami
patent: 5502579 (1996-03-01), Kita et al.

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