Method and circuit arrangement for selective correction of hues

Details Method and circuit arrangement for selective correction of hues Method and circuit arrangement for selective correction of hues

1984-12-12

1987-03-10

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

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H04N 146

Patent

active

046494235

ABSTRACT:
A method and circuit arrangement for selective correction of hues and colors in the production of color separations for polychromatic mixed printing. A hue signal identifying the hues of the scanned colors as well as a color saturation signal and a luminance signal are derived from the measured color value signals acquired when scanning the original. Hue signals, color saturation signals and luminance signals are limited such that they are respectively not equal to zero only for selectable regions. The region of the hue signal defines a hue to be selectively corrected, and all three regions of the signals define a color to be selectively corrected. At least one of the limited signals is combined with at least one of the unlimited signals to form the selective correction signals which are superimposed on the color signals to be corrected.

REFERENCES:
patent: 4194839 (1980-03-01), Knop
patent: 4307962 (1981-12-01), Jung

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