Color image processing method and apparatus utilizing the same

Details Color image processing method and apparatus utilizing the same Color image processing method and apparatus utilizing the same

Filed on

1997-08-25

Date issued

1998-09-01

Examiner

Moore, David K.

Patent Class

Facsimile and static presentation processing

SubClass

Natural color facsimile

SubSubClass

Color correction

Other Related Categories

358520, H04N 140

Type

Patent

Status

active

Patent number

058018557

Description

ABSTRACT:
A color image processing apparatus converts a first color signal (RGB signal) stored in a frame memory for displaying on, e.g., a CRT color monitor into a third color signal (R'G'B' signal) whose color image information is used for permanent visible representation by a printer, and outputs the third signal in order to effectively adjust differences between color gamuts of different devices. In the conversion processing, a conversion function for directly converting the first color signal into the third color signal is obtained by synthesizing three functions, namely, a first conversion function for converting the first color signal into a standard color space signal, a second conversion function for converting the standard color space signal into the third color signal, and a third conversion signal for converting the standard color space signal into another standard color signal suitable for a color gamut of the printer. The first color signal is converted into the third color signal in accordance with the new synthesized conversion function.

REFERENCES:
patent: 4758885 (1988-07-01), Sasaki et al.
patent: 5126838 (1992-06-01), Ohsawa et al.
patent: 5130819 (1992-07-01), Ohta
patent: 5377025 (1994-12-01), Spaulding et al.
patent: 5402253 (1995-03-01), Seki
patent: 5448380 (1995-09-01), Park

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