Method for producing color and black plates in a multi-color plate making apparatus
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United States of America Patent
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Jul 28, 1992
Grant Date -
N/A
app pub date -
May 23, 1991
filing date -
Feb 4, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Light intensity values as picture information of a color original are obtained by using photographic density characteristic curves of the color-film original, instead of conventional density values. Thus obtained light intensity values are processed by conducting a specific tonal conversion formula (1) to obtain color-separation curves for color (C, M and Y) plates. On the basis of the color-separation curves for the color plates, a range to be entered black is determined, and a color-separation curve for a black (B) plate is set by conducting the same tonal conversion formula (1).
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