Tonal conversion method for a faded color photographic original picture
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United States of America Patent
Stats
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May 18, 1993
Grant Date -
N/A
app pub date -
Apr 8, 1992
filing date -
Jul 30, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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