Lloyd Clark


The linearity of image transfer is analyzed for a high resolution electrophotographic film and electrodeveloper combination. The extent of nonlinearities introduced upon transfer through the photoconduction and electrodevelopment stages is conceptualized in terms of inherent physical mechanisms. A spectral shift in narrow band exposing radiation is used to test significance of exponential absorption on linearity of photoconduction transfer. Variations in development electrode spacing and development time test for nonlinearity induced by temporal and spatial frequency dependent depletion of electrodeveloper particles. As the electrophotographic film employed in the test exhibited low absorption coefficients in all spectral bands, exponential absorption of exposing radiation did not significantly alter linearity of edge image transfer. Results for edge and sinusoidal image transfer indicated nonlinear depletion effects shortly after development initiation. Increased development times reduced adjacency effects for edge distributions and lower harmonic distortions for sinusoidal image distributions. Initial adjacency effects and time rate of change toward linear edge responses are altered by electrode spacing for one electrodevelopment apparatus tested. Reasonable approximations to linear image transfer are obtained as electrodevelopment approaches completion, regardless of electrode spacing or electrodevelopment apparatus employed.

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School of Photographic Arts and Sciences (CIAS)


Saunders, Burt

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Carson, John

Advisor/Committee Member

Gilatti, Edward


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