Photographic elements which achieve colorimetrically accurate recording

US5582961A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Edward J. Giorgianni · Rochester, US
• Brian E. Mittelstaedt · Rochester, US
• Richard A. Simon · Rochester, US
• Teresa A. Smith · Watertown, US
• James E. Sutton · Rochester, US

Key dates

• Filing date: Jun 6, 1995
• Grant date: Dec 10, 1996
• Expiry date: Jun 6, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C7/3041
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A photographic element, is disclosed which includes a support and at least three silver halide emulsion layers, that records exposure information. The exposure information is recorded in three image-recording units and wherein the spectral sensitivities of said image-recording units are chosen such that the average color error, .DELTA.E*.sub.ab, is less than or equal to 3.1. .DELTA.E*.sub.ab is computed for a specified set of test colors of known spectral reflectance, and the light source is specified as D.sub.65. .DELTA.E*.sub.ab is the average CIE 1976 (L*a*b*) .DELTA.E*.sub.ab between the CIE 1976 (L*a*b*)-space coordinates of said test colors and the CIE 1976 (L*a*b*)-space coordinates corresponding to transformed exposure signals. The transformed exposure signals are formed by applying an exposure-space matrix to the exposure signals derived from the photographic element to transform the derived exposure signals to exposure signals corresponding to the color-matching functions of the CCIR Recommendation 709 primary set. The exposure-space matrix is derived so as to minimize ##EQU1## and noise-gain factor, .PSI., defined as the sum of the square roots of the sum of the squares …