H. Morgan


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

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Not listed


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TR515.M67


RIT – Main Campus