Fractional image areas based on measured transmittance distributions of contact screens having screen frequencies of 50 - 150 lines/inch* (1.95 - 4.66 cycles/mm) are compared to measured fractional image areas produced on lithographic film using the same contact screens. The Modulation Transfer Function (MTF) of the lithographic film is calculated for spatial frequency inputs of 1.95 - 12.00 cycles/mm. Based on these experiments, a mathematical model was developed to describe how the fractional image area of a halftone is dependent on spatial frequency of the contact screen, predicted fractional image area based on the screen ' s transmittance distribution, and development time.
Library of Congress Subject Headings
Contact transformations; Photographic optics; Photoengraving--Halftone process
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
Kliman, Arthur, "Characterization of a Contact Screen System as Used in the Graphic Arts" (1977). Thesis. Rochester Institute of Technology. Accessed from
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