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Proceedings Paper

Effect Of Nonlinearities When Applying Modulation Transfer Techniques To Photographic Systems
Author(s): C. N. Nelson; F. C. Eisen; G. C. Higgins
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Paper Abstract

The concept of a unique modulation transfer function for a photographic system is often inadequate because of the nonlinearities that exist in the system. Examples of the nonlinearities are the spatial interactions in the development process and the relation between exposure and the transmittance of the developed image. The effective MTF of the system may vary with the exposure level and with the nature of the input exposure patterns. Sinus-oidal exposure patterns, for example, can yield a different effective MTF than white noise patterns. In a negative-positive system, the use of low-gamma negative material with a high-gamma positive material may give better sharpness than the converse even though cascading of the component modulation transfer functions indicates no difference in system MTF. The distorted waveform generated by the nonlinearity of a high-gamma negative contains high-frequency harmonics that can overtax the resolution capabilities of the printing components. Since linear analysis is inadequate for these problems, certain methods of non-linear analysis are being applied. In one of them, a second degree prediction formula is used in conjunction with separate optical and chemical spread functions.

Paper Details

Date Published: 1 September 1968
PDF: 8 pages
Proc. SPIE 0013, Modulation Transfer Function, (1 September 1968); doi: 10.1117/12.946758
Show Author Affiliations
C. N. Nelson, Eastman Kodak Company (United States)
F. C. Eisen, Eastman Kodak Company (United States)
G. C. Higgins, Eastman Kodak Company (United States)

Published in SPIE Proceedings Vol. 0013:
Modulation Transfer Function
Robert R. Shannon; Richard J. Wollensak, Editor(s)

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