This thesis proposes a method of using reflection density readings taken with a conventional graphic arts densitometer to provide a numeric measure of the visual difference between a sample press sheet and a reference sheet. This numerical measure was developed based on the theory that human response to variation in process color printing is more affected by changes in the proportions of process inks to each other than by variation in the overall inking level of the press sheet. The thesis then goes on to explain how the proposed system was tested. First, a set of color samples was generated. Observer evaluations of these color samples were converted to numeric values using psychometric evaluation methods. Using statistical methods, observer evaluations in numeric form were then tested against values obtained by using the proposed system. Observer evaluations of the color samples were also compared statistically with values from the Total Color Difference system as an additional test. The thesis concludes that the proposed system is a reliable predictor of observer response to color variation when the system is used for the purpose of comparing reference press sheets to sample press sheets.
Library of Congress Subject Headings
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
Harris, Russell, "Proposal and Investigation of a Method for Measuring Process Color Variation via Reflection Densitometer" (1982). Thesis. Rochester Institute of Technology. Accessed from
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