Importance

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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.

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First Claim