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US 4,792,518 AGranted
Silver halide color reversal reflection print sensitive material
AssigneeFuji Photo Film Co., Ltd.
InventorsShigeru Kuwashima, Akio Mitsui, Masaru Sano
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AssigneeFuji Photo Film Co., Ltd.
InventorsShigeru Kuwashima, Akio Mitsui, Masaru Sano
Estimating the term…
A silver halide color reversal reflection print photosensitive material comprises at least one blue-sensitive layer, at least one green-sensitive layer and at least one red-sensitive layer on a support. In the characteristic curves of the color sensitive layers, a fluctuation width of point-gammas and absolute values of point-gammas are defined. The distribution of the grain size of the silver halide grains in silver halide emulsions contained in the color sensitive layer can be controlled by forming the grains in the presence of a silver halide solvent.
A silver halide color reversal reflection print photosensitive material having at least one blue-sensitive layer, at least one green-sensitive layer and at least one red-sensitive layer on a support, wherein in all the characteristic curves of said color sensitive layers, the fluctuation width of the point-gammas at each of points within the exposure range corresponding to a developed color density of from 1.8 to 0.8 is within .+-.15% of the average value of the point-gammas in said exposure range, and the absolute value of the point-gamma at each of points within the exposure range corresponding to a developed color density of from 0.3 to 0.2 is 0.3 or more, at least one of the color-sensitive layers comprising two or more silver halide emulsion layers having different sensitivities with respect to each other, in which the emulsion layer having the lowest sensitivity is a monodispersed emulsion layer.
Dependencies are inferred from the claim text.
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Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein: apparatus or processes for the…
Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials: materials with specific…
Processes using silver-salt-containing photosensitive materials or agents therefor: reversal development; Contact processes
Multicolour photographic processes or agents therefor
Term ended 20 Dec 2005 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a silver halide color reversal reflection print photosensitive material and in particular to a silver halide color reversal reflection point photosensitive material that can exhibit excellent tone reproductivity in any case where an original is a transmission original or reflection original.
In preparing a color reversal reflection print, the originals can be calssified generally into transmission originals and reflection originals. The transmission originals can be so-called slide photographs and the reflection originals can be color prints, instant photographs, printed materials, etc.
Generally, in producing color reversal reflection prints, depending upon whether the original is a transmission original or a reflection original, there will be a large difference in the exposure range of the color reversal reflection print photosensitive material. That is, in the case of transmission originals, the maximum density of the originals is about 2.8 to 3.3, and to reproduce all the information of the originals, a wide exposure scale is required of the color reversal reflection print photosensitive material; while in the case of reflection originals, since the maximum density is about 1.5 to 2.5, which is lower than that of the transmission originals, a characteristic curve that can provide enough color density in a narrow exposure range is required of the color reversal reflection print photosensitive material.
FIG. 1 shows schematic curves of a D-log E curve (solid line) and a dD/d log E-log E curve (broken line) of an example for a silver halide color reversal print photosensitive material.
FIG. 2 and FIG. 3 each shows a D-log E curve (solid line) and a dD/d log E-log E curve (broken line) for the green-sensitive emulsion layer of Photosensitive Materials A and F, respectively, in Example.
The term "characteristic curve" used herein refers to the so-called D-log E curve as shown by the solid line graph in FIG. 1 wherein log E (E denotes exposure amount) is plotted along the abscissa and D (D denotes density) is plotted along the ordinate, and is explained in greater detail, for example, in The Theory of the Photographic Process by T. H. James, 4th Edition, pages 501-509.
The term "point-gamma" used herein is obtained as follows:
point-gamma=dD/d log E