Color tone correcting apparatus

Details Color tone correcting apparatus Color tone correcting apparatus

1993-03-30

1994-08-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358518, 358537, 358515, H04N 146, G03F 308

Patent

active

053350979

ABSTRACT:
Where color components of output signals are RGB signals, a pixel in an original image displayed on a monitor screen is designated to designate RGB signals of a color to be corrected. At the same time, RGB signals of a target color are inputted through a data input device. An effective range of tone correction processing is designated through the data input device based on hue H, saturation S and lightness L with reference to the color to be corrected. Default values are used as an alternative to the designation. The RGB values of pixels in the original image are converted into HSL values to determine whether the pixels are within the effective range expressed by the HSL values. If the pixels are within the effective range, a tone correction is effected by applying parameters derived from the color to be corrected (RGB signals) and target color (RGB signals) to the RGB signals of the pixels. These parameters are amended to be the smaller toward boundaries of the effective range.

REFERENCES:
patent: 4623973 (1986-11-01), Hoffrichter et al.
patent: 4642682 (1987-02-01), Orsburn et al.
patent: 4916531 (1990-04-01), Genz et al.
patent: 5130935 (1992-07-01), Takiguchi
patent: 5204665 (1993-04-01), Bollman et al.
patent: 5204948 (1993-04-01), Kato

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