Tonal conversion method of pictures for producing reproduced pic

Details Tonal conversion method of pictures for producing reproduced pic Tonal conversion method of pictures for producing reproduced pic

1990-02-16

1991-10-15

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 358 80, H04N 123, H04N 1387, H04N 146

Patent

active

050579312

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.

REFERENCES:
patent: 4811108 (1989-03-01), Numakura
patent: 4833546 (1989-05-01), Numakura
patent: 4924323 (1990-05-01), Numakura
patent: 4956718 (1990-09-01), Numakura

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