Patent · US Expired

Method of and an apparatus for classifying color films

US4422752A · kind A · utility

18Cited by

2References

19Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Siegfried Thurm · Meerbusch, DE
Konrad Bunge

Key dates

Filing date	Mar 10, 1980
Grant date	Dec 27, 1983
Priority date	—
Expiry date	Mar 10, 2000

Classification

Technology area (CPC G)Physics
CPC primaryG03B27/735
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An exposed color film having an exposed zone is provided with color areas prior to developing the same by exposing this unexposed zone to light passing through different narrow-band filters. After developing the film, the transmissivities of each of the color areas within a pair of narrow-band ranges is measured. The measured values are compared with known values for various types of film to establish the type of the particular color film. This information is used to adjust the exposures in the different colors when the images on the color film are copied onto a photographic copying material.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.