Method and apparatus for processing picture image signals

Details Method and apparatus for processing picture image signals Method and apparatus for processing picture image signals

1986-09-11

1989-07-04

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

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358 75, G03F 308, H04N 146

Patent

active

048455504

ABSTRACT:
A method and process for processing picture image signals detects color separation signals of a color original image and then respectively converts these color separation signals into digital color separation signals. These digital color separation signals are then multiplied by predetermined coefficients and the results of these multiplications are sequentially accumulated for equalizing the levels of the digital color separation signals at a grey point of the original image so as to thereby obtain digital color separation signals which are converted to equivalent neutral densities. Hue signals of yellow, green, cyan, blue, magenta, and red which divide a color space into six hues are obtained from the digital color separation signals which are converted to the equivalent neutral densities. The hue signals are multiplied by predetermined color correction coefficients and the results thereof accumulated for color correction signals on yellow, magenta, and cyan. The digital color separation signals which are converted to the equivalent neutral densities are added to the color correction signals so as to thereby obtain selective color correction signals for recording the original image.

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James, T. M., Editor, The Theory of the Photographic Process, Fourth Edition, Macmillan Publishing Co., Inc., New York, 1977, pp. 519-526.

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