Accession Number : ADD004111

Title :   Method of Obtaining a D(Log E) Curve.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Piech,Kenneth R ; Schott,John R

Report Date : 07 Jun 1977

Pagination or Media Count : 7

Abstract : The D(log E) curve of an unknown film is obtained by first measuring a first film having a known D(log E) curve and of the same type as the unknown film. Measured are the densities of a plurality of objects and their corresponding distances for which the object densities decay to film base densities. These values are plotted and with the known D(log E) curve, an x(log E) curve is obtained which is valid for all films of this type. The unknown film is measured to obtain values of object densities and corresponding decay distances and a curve of the values is obtained, and when used with the x(log E) curve for the film type, a new D(log E) curve is obtained for the unknown film. (Author)

Descriptors :   *Patents, *Photographic analysis, *Photographic film, Measurement

Subject Categories : Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE