Patent Number: 6,169,599

Title: Method for determining the amount of light in each primary color when copying a colored original

Abstract: There is disclosed a method for determining the amounts of individual copying light when copying color originals, particularly color negatives which are combined into films. The color originals are scanned photoelectrically and separately in the primary colors by region or by point, and the results of the measurement are used to control the amounts of copying light. For each scanned region a first difference is formed between the density values of two basic colors, a second difference is formed between the density values of one of these basic colors and the third basic color, and the average density is formed from the density measurements of the three basic colors. In each case, a functional relationship with the average density is produced, known as a color density difference curve, which describes the color behavior of the recording material on which the copy is to be made. This functional relationship supplies film-specific values for producing copies of the film, the film-specific values being used for the determination of the amounts of copying light for the original to be copied. For films of one type, the functional relationship between color density difference values and average densities describing the color behavior common to this are determined and stored as standard color density difference curves. When a film of this type appears, these stored standard color density difference curves are used to determine copying light quantities.

Inventors: Fuersich; Manfred (Taufkirchen, DE), Treiber; Helmut (Munich, DE), Zahn; Wolfgang (Munich, DE)

Assignee: Agfa-Gevaert Aktiengesellschaft

International Classification: G03B 27/73 (20060101); G03B 027/80 (); G03B 027/32 ()

Expiration Date: 01/02/2018