A rotary stage microdensitometer was interfaced to an Apple II personal computer for the purpose of making rapid rms granularity measurements. An experimentally determined relationship was found between standard deviation in voltage and rms granularity. By using this relationship the device proved accurate to within 7 percent of the known values of rms granularity on a conventional microdensitometer for the same samples with 95 percent confidence.
Library of Congress Subject Headings
Photography--Equipment and supplies; Photographic sensitometry
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
John D. Westbrook
Williams, Daniel J., "Digitization, testing, and evaluation of a device for rapid determination of rms granularity" (1982). Thesis. Rochester Institute of Technology. Accessed from
RIT – Main Campus