Method for the tonal control or adjustment of reproduced color i

Details Method for the tonal control or adjustment of reproduced color i Method for the tonal control or adjustment of reproduced color i

1996-05-22

1998-11-24

Vu, Kim Yen

Image analysis

Color image processing

Drop-out color in image

358504, 358527, H04N 154

Patent

active

058418970

ABSTRACT:
A method is provided for the control of a color tone during production of a reproduced color image by tonal conversion of a light quantity of each pixel into a halftone. The method includes setting, at a position between a highlight area and a shadow area in a color original image, a color tone control point, defining adjustment conditions at the color tone control point in terms of dot percent values of desired plural color plates. The method also includes introducing a light quantity at the color tone control point, dot percent values of the plates and desired dot percent values set in advance for highlight areas and shadow areas in the plates into a tonal conversion formula to determine values .gamma. for the plates conversion formulas are provided for converting, into dot percent values, light quantities of all pixels ranging from the highlight areas to the shadow areas. The method also includes subjecting light quantities of individual pixels for the plates to tonal conversion and also controlling color tones of the individual pixels for the plates by using the tonal conversion formulas.

REFERENCES:
patent: 5287418 (1994-02-01), Kishida

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