Abstract

The optimum tone-reproduction characteristics were determined for a high contrast, a low contrast and a controlled contrast scene, by subjective analysis of the resulting prints. From this, mathematical models of the optimum film characteristic curves and fractional gradients were derived. Optimal system gamma (filmT x paper 7 ) was determined to be between 1.2 and 1.4, however, the gradient contrast was determined for the film so that contrast is defined over the entire toe and straight line regions. Luther's equation and its derivitive were used as the models in this study, and it was found that these can be used to describe a given film's characteristics over a wide range of development times.

Publication Date

1982

Document Type

Thesis

Student Type

Undergraduate

Degree Name

Imaging Science (BS)

Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)

Advisor

Edward Granger

Campus

RIT – Main Campus

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