Tonal conversion method for a picture

Details Tonal conversion method for a picture Tonal conversion method for a picture

1991-11-12

1994-10-18

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358458, H04N 140

Patent

active

053573498

ABSTRACT:
A tone of a picture is converted upon producing a printed picture in a halftone from a photographic original picture in a continuous tone, where density values (D.sub.HO to D.sub.So) ranging from a highlight part to a shadow part of a reference photographic original picture are converted into corresponding light intensity information values (X.sub.Ho, X.sub.So), then into tonal conversion intensity values (yn) to determine a reference tonal conversion curve (y.sub.o) by conducting a specific tonal conversion formula (1). On the other hand, density values (from D.sub.Hn to D.sub.Sn) ranging from a highlight part to a shadow part of the individual photographic original picture are converted into corresponding light intensity information values (X.sub.Hn to X.sub.Sn), the into tonal conversion intensity values (y.sub.n) to determine an individual tonal conversion curve (y.sub.n) in a similar manner. Then, the individual tonal conversion curve (y.sub.n) is made to coincide with the reference tonal conversion curve (y.sub.o) in a predeterminedly divided region.

REFERENCES:
patent: 4811108 (1989-03-01), Numakura et al.
patent: 4833546 (1989-05-01), Numakura et al.
patent: 4924323 (1990-05-01), Numakura et al.
patent: 4956718 (1990-09-01), Numakura et al.
patent: 5072305 (1991-12-01), Numakura et al.

Affiliated with

Also associated with

Rating

Tonal conversion method for a picture does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tonal conversion method for a picture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tonal conversion method for a picture will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2376321