Tonal conversion method of pictures for producing reproduced pictures free of color-fog
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United States of America Patent
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Oct 15, 1991
Grant Date -
N/A
app pub date -
Feb 16, 1990
filing date -
Aug 19, 1989
priority date (Note) -
Expired
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Abstract
A tonal conversion method of pictures useful upon producing reproduced pictures such as halftone pictures free of color-fog from color-fogged color original pictures of continuous tone. The tonal conversion is conducted in a manner that objective data relating to color-fog from a color original picture having color-fog thereon are obtained using undistorted X-axis pictorial information values for respective C, M and Y color plates obtained from the corresponding density values on the D axis in accordance with corresponding density characteristic curves of R, G, B photosensitive emulsion layers of a color film used upon photographing the original color pictures, thereby providing reproduced pictures free of color-fog by using a specific tonal conversion formula.
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