Silver halide photographic material
AssigneeKonica Corporation
InventorsHideyuki Kobayashi, Kuniaki Uezawa
Life of this patent
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Abstract
A silver halide photographic material which is in the form of a roll film packaged in a cartridge, and which exhibits superior print stability and is capable of providing prints with superior image quality when printed onto printing paper is disclosed, comprising on a support a red-sensitive layer, a green-sensitive layer and a blue-sensitive layer, wherein the quality value (QC) satisfies the following requirement QC≧15.982×S−0.378 (100≦S≦1600) where S is the nominal speed of the photographic speed.
Claims8
A silver halide photographic material which is in the form of a roll film packaged in a cartridge, comprising on a support a red-sensitive layer, a green-sensitive layer and a blue-sensitive layer, wherein the photographic material satisfies the following equation (1):
- QC≧15.982×S−0.378 (1)
- wherein S represents a nominal speed of the photographic material, provided that 100≦S≦1600;
- and QC represents a quality value which is determined by the process comprising:
- (i) photographing a Macbeth color checker chart including 6 neutral gray areas and 18 color areas using the photographic material under a light source having a color temperature of 4800° K. with a camera at an under-exposure of 3 stops-down from normal exposure in which the aperture of the camera is reduced by 3 steps from that of the normal exposure,
- (ii) processing the thus exposed photographic material, (iii) printing the processed photographic material on a color paper to produce a color print, under such an exposure condition that an area on the print, corresponding to a Neutral 5 gray area of the Macbeth color checker chart gives values of L*=50, a*=0 and b*=0,
- (iv) subjecting the print to chromaticity measurement to determine chroma values of areas on the print corresponding to the 18 color areas of the Macbeth color checker chart, and
- (v) calculating the QC value in accordance with the following equation (2):
- QC=(Cr+Ch)/2 (2)
- wherein Cr and Ch are defined in the following equations (3) and (4):
- Cr=20×log10(Cr0) (3) Ch=7.0−3×log10(Ch0) (4)
- wherein Cr0 is a ratio of a mean value of chroma values of 18 color areas of the Macbeth color checker chart to a mean value of chroma values of the areas on the print corresponding to the 18 color areas of the Macbeth color checker chart;
- and an absolute value of a difference in angle between a color vector of each of 18 colors of the Macbeth color checker chart and that of an area on the print corresponding to each of the 18 colors is determined and an average value of the thus determined absolute values of the 18 colors is defined as Ch0.
Dependencies are inferred from the claim text.