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AssigneeEastman Kodak Company
InventorsRobert A. Arcus, Peter N. Bacel, John A. Weldy
Estimating the term…
Rapid development of silver bromoiodide color negative photographic films and formation of high quality negative images suitable for scanning to produce display images of excellent quality is made possible by a novel developer solution composition and method of development. The solution is characterized by containing, in addition to the color developer compound and conventional photographic developer solution components, a water soluble pyrrolidone polymer, a high concentration of sulfite ion and a low concentration, or the absence of, bromide ion. In the novel method the developer composition contacts the exposed film at elevated temperature, e.g., 40 to 66° C., for a short development time, e.g., 20 to 90 seconds. The developed image has image quality suitable for scanning and digital manipulation to produce a digital record for forming a color display image of high quality.
A method for developing an imagewise exposed silver bromoiodide color negative photographic film, which comprises contacting said film for a time period of about 20 seconds to 90 seconds at a temperature from about 40° C. to 66° C. with a developing solution resulting in a developed film, wherein said developing solution comprises:
Dependencies are inferred from the claim text.
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Development processes or agents therefor: developers
Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials: development processes or agents…
Characterised by the crystal form or composition, e.g. mixed grain: bromide content
Materials with specific sensitometric characteristics, e.g. gamma, density: original suitable to be scanned
Term ended 3 Nov 2020 (estimated)
This invention relates to a novel developer composition for photographic color negative films and to a method of development that provide rapid development and production of high quality color display images.
Production of photographic color images from light sensitive silver halide materials basically consists of two processes. First, color negative images are generated by light exposure and processing of camera speed, light sensitive films, that are sometimes called “originating” elements because the images are originated therein by the film user (that is, “picture taker”). These negative images are then used to generate positive images in light sensitive materials. These latter materials are sometimes known as “display” elements and the resulting images may be known as “prints” when coated on reflective supports or “films” when coated on nonreflective supports.
The light sensitive materials are processed in automated processing machines through several steps and processing solutions to provide the display images or prints. Traditionally, this service has required a day or more. In recent years, customers have wanted faster service, and in some locations, the time to deliver this service has been reduced to within an hour. Reducing the processing time to within a few minutes is the ultimate desire. To do this, each step must be shortened.
Materials and methods used in the example are as follows:
Film: The films used in the example were 1 inch by 12 inch strips of either Kodak Royal Gold 400 and Kodak Max 800. They have, respectively, ASA photographic speeds of 400 and 800 ASA.
Film Exposure: The films were exposed on a Kodak 1B sensitometer through a 21 step tablet that incremented the step density in units of 0.2 density from a density of 0 to a density of 4.0. The light source was a simulated daylight exposure with a color temperature of 5500 K.