Color converting circuit for use in an image forming apparatus

Details Color converting circuit for use in an image forming apparatus Color converting circuit for use in an image forming apparatus

1993-03-05

1996-07-23

Tran, Huan H.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358522, 347232, G03F 308

Patent

active

055395392

ABSTRACT:
The average value of each of yellow, magenta and cyan color image data of a color-to-be-converted which data are obtained at the time of pre-scanning of a copying machine and stored in memories, respectively, is calculated, and then, predetermined set values are respectively added to and subtracted from the calculated average values of yellow, magenta and cyan to obtain upper and lower limit values of the conversion range. When the lower limit value obtained by subtraction is below a predetermined lower limit restriction value, the lower limit restriction value is set as the lower limit value of the conversion range. With this feature, when an extremely pale color is specified as a color-to-be-converted in a region other than a background portion of a color original where no letters, etc. are printed, the color of the background portion is not converted together with the specified color.

REFERENCES:
patent: 5138443 (1992-08-01), Ikeda et al.
patent: 5177602 (1993-01-01), Fujimori
patent: 5307182 (1994-04-01), Maltz
Hung, Po-Chieh, "Colorometric Calibration for Scanners and Media", Feb. 1991, a report from Konica Corporation.

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