Tonal conversion method for a faded color photographic original

Details Tonal conversion method for a faded color photographic original Tonal conversion method for a faded color photographic original

1992-04-08

1993-05-18

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Methods

355 38, G03B 2732, G03B 2780

Patent

active

052125181

ABSTRACT:
Herein disclosed is a tonal conversion method for a faded color original picture useful upon producing a printed picture in a halftone from a faded color photographic original in a continuous tone. As picture information of tonal conversion, unfaded light intensity values (Xn) of a pixel in a faded color photographic original, instead of density information values (D.sub.Fn) of a corresponding pixel of the same, are used. The light intensity values (Xn) may be rationally determined, utilizing an assumption of dye loss and density characteristic curves (S-DCC) of a photographic photosensitive material. The light intensity values (Xn) are then converted into halftone dot area % values by conduction of a specific tonal conversion formula.

REFERENCES:
patent: 4870455 (1989-09-01), Morgan, Jr.
patent: 4888611 (1989-12-01), Smallwood, II
patent: 4975737 (1990-12-01), Murooka et al.
patent: 5010398 (1991-04-01), Nys et al.
patent: 5072305 (1991-12-01), Numakura et al.

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