Correction table forming method and image forming apparatus

Details Correction table forming method and image forming apparatus Correction table forming method and image forming apparatus

2005-08-16

2005-08-16

Williams, Kimberly (Department: 2626)

Facsimile and static presentation processing

Natural color facsimile

Color correction

C358S003200, C358S003060, C358S536000

Reexamination Certificate

active

06930810

ABSTRACT:
A main CPU reads out CMY values as γ correction patch data from an NVRAM, and outputs a γ correction patch from a color printer section via a γ correction patch output section. The output γ correction patch (sheet) is read by a color scanner section1as RGB image data. The RGB image data is converted to CMY color signals by a color conversion section131and input to the main CPU via a buffer memory. The main CPU calculates patch read data from the CMY color signals and compares it with the γ correction patch data stored in the NVRAM. The main CPU then calculates an inverse function of a curve of the patch read data and forms γ correction tables of four colors, C, M, Y and K. The γ correction tables are used for full-color γ correction. On the other hand, the main CPU performs an arithmetic operation (error correction) of an error correction table h(x), with an output of black (K) at screen angle −63° being f(x) and an output of mono-color black (K) at screen angle 90° being g(x). The error correction table h(x) is used for γ correction of mono-color black.

REFERENCES:
patent: 4752822 (1988-06-01), Kawamura
patent: 5045931 (1991-09-01), Sakamoto
patent: 5101283 (1992-03-01), Seki et al.
patent: 5124803 (1992-06-01), Troxel
patent: 5130820 (1992-07-01), Hirota
patent: 5166809 (1992-11-01), Surbrook
patent: 5249042 (1993-09-01), Kaji et al.
patent: 5253082 (1993-10-01), Hayashi et al.
patent: 5404156 (1995-04-01), Yamada et al.
patent: 5687300 (1997-11-01), Cooper
patent: 5731884 (1998-03-01), Inoue
patent: 5774229 (1998-06-01), Delabastita
patent: 5778091 (1998-07-01), Shibazaki et al.
patent: 5781709 (1998-07-01), Usami et al.
patent: 5831626 (1998-11-01), Sano et al.
patent: 5937232 (1999-08-01), Taguchi et al.
patent: 5966222 (1999-10-01), Hirata et al.
patent: 6029023 (2000-02-01), Munemori et al.
patent: 6115150 (2000-09-01), Nakamura et al.
patent: 6121997 (2000-09-01), Fukushima
patent: 6313924 (2001-11-01), Kanamori
patent: 6721062 (2004-04-01), Sawada et al.
patent: 6724498 (2004-04-01), Shimazaki
patent: 2003/0081255 (2003-05-01), Shimizu
patent: 63-125055 (1988-05-01), None
patent: 5-169720 (1993-07-01), None
patent: 9-233335 (1997-09-01), None
patent: 11-088661 (1999-03-01), None

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