Method for color correction for multi-color printing plate pictu

Facsimile and static presentation processing – Static presentation processing – Attribute control

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358 75, H04N 1387, H04N 146

Patent

active

046565051

ABSTRACT:
A method for color correction in the process for reproducing a picture in which color separation picture signals obtained by photoelectrically scanning an original picture are converted into picture signals which correspond to four printing color inks including a black ink therein to produce respective reproduction pictures for plate making corresponding to each of the color inks. A picture signal which corresponds to a black ink is produced according to gray color components obtained from B, G and R signals of the original picture, and according to chromatic color components obtained by subtracting neutral color components from said B, G and R signals. Color separation picture signals corresponding to other color inks, and deficiency in reproduction density of the black ink to be used in a black print is corrected by said other three color inks.

REFERENCES:
patent: 3324235 (1967-06-01), Kyte
patent: 4060829 (1977-11-01), Sakamoto
patent: 4402015 (1983-08-01), Yamada
patent: 4551751 (1985-11-01), Jung
patent: 4590515 (1986-05-01), Wellendorf

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