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AssigneeEastman Kodak Company
InventorsKenneth J. Reed, Sang H. Kim, Thomas R. Dobles, David A. Stegman
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A photographic element which has a blue sensitive emulsion with broad blue spectral coverage and yet, good speed and low fog. The element has a blue sensitive silver halide tabular grain emulsion which has a tabularity of at least 25 sensitized with a dye of formula (I) and a dye of formula (II), wherein the formula (I) dye on the emulsion has a peak sensitization of between 400-445 nm and the formula (II) dye on the emulsion has a peak sensitization of between 446-500 nm: ##STR1## wherein: Z.sub.1, Z.sub.2, Z.sub.3 and Z.sub.4 independently represent the atoms necessary to complete a substituted or unsubstituted benzene or naphthylene; X, Y, X.sub.1 and Y.sub.1 are independently O, S, Se or MR.sub.5, provided that at least X or Y is O or NR.sub.5, where R.sub.5 is a substituted or unsubstituted alkyl or aryl; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent H or a substituted or unsubstituted alkyl or aryl.
A photographic element comprising a blue sensitive negative working silver halide tabular grain emulsion which has a tabularity of at least 25 the grains of which are primarily surface-sensitive, sensitized with a dye of formula (I) and a dye of formula (II), wherein the formula (I) dye on the emulsion provides a peak sensitization of between 400-445 nm and the formula (II) dye on the emulsion provides a peak sensitization of between 446-500 nm:
A color photographic element comprising a red sensitive silver halide emulsion layer containing a coupler which produces a cyan dye upon reaction with oxidized developer, a green sensitive silver halide emulsion layer containing a coupler which produces a magenta dye upon reaction with oxidized developer, and a blue sensitive silver halide emulsion layer containing a coupler which produces a yellow dye upon reaction with oxidized developer, the blue sensitive silver halide emulsion layer comprising a silver bromoiodide negative working tabular grain emulsion the halide content of which is less than 8% iodide and less than 10% chloride and the grains of which are primarily surface-sensitive, and which has a tabularity of at least 25 and is sensitized with a dye of formula (I) and a dye of formula (II) such that the wavelength of maximum sensitivity of the emulsion between 400-500 nm (".lambda..sub.Bmax "), the sensitivity at 485 nm ("S.sub.485 "), the sensitivity at 410 nm ("S.sub.410 "), and the sensitivity at .lambda..sub.Bmax ("S.sub.Bmax "), are defined by:
Dependencies are inferred from the claim text.