In the field of densitometry, there is a current trend to create standards which are more specific, more technical, and more practical than the standards which have been produced in the past. This paper deals with the design, construction, and evaluation of an instrument which conforms to one of these standards. A bit more was added, in that the instrument was made to be used with negative color materials. The instrument constructed was a spectral, projection, transmission, three-component, subtractive color densitometer head. One of the unique characteristics of the instrument is the fact that a spectral lamp was used for the light source. This gave evaluating wavelengths that were quite narrow. The instrument measured a new type of density called 'projected density'. The term being derived from the geometric conditions specified in the standard. The geometry specified is similar to that one might find in a micro-film reader. For samples that were measured on the new instrument and on a conventional instrument, densities were found to be higher on the new instrument,due probably to a narrower collection angle. Specifications are given for building a prototype instrument.
Library of Congress Subject Headings
Color sensitometry (Photography); Photography--Equipment and supplies--Testing; Photographic optics
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
Morgan, H., "The Design, Construction, and Calibration of a Spectral, Projection, Transmission, Three-Component, Subtractive Color Densitometer Head" (1970). Thesis. Rochester Institute of Technology. Accessed from
RIT – Main Campus