Measurement of Spectral Density

The Research Institute of Sound and Picture — VÚZORT — had the goal of developing a sensitometric method, giving measurement results applicable to manufacturing control of color film and its processing technology. For this, results must not be influenced by measuring instruments, especially the densitometer. Theoretically, the best way is to use equivalent neutral densities which give a maximum of information about the measured sample. But these densities cannot be measured easily and need very expensive equipment. The scientists of the Institute came to the conclusion that the best method of fulfilling established requirements must be based on monochromatic measurements, which are comparable to the ASA standard. Monochromatic wavelengths have been chosen according to the dyes and types of materials to be measured. They fulfill the condition that when a neutral gray sample is measured equal values for all three primary wavelengths are obtained. Theoretical analysis led to the establishment of a method called SENCOMET (Sensitometric Control Method). Measured values are transferred by means of nomograms, or tables, or directly by an analog computer, into the necessary correcting steps in the processing technology. The latest type of instrument developed is the Czechoslovak Automatic Recording Color Densitometer KBD II. It is being successfully used in research institutes, motion-picture film processing laboratories and photochemical plants.

Print ISSN

0361-4573

Published

1972-08

Content type

Original Research

DOI

10.5594/J13500