This thesis evaluated the color appearance predictions of four digital color transforms (Hunt, RLAB, CIELAB, and von Kries) between CRT "original" images, viewed in a lighted room, and projected slides, viewed in the dark. Calibrated projection of these images required resolution of several complex issues. Upon projection, the slide colors changed. A rapid color shift (on the order of 75 seconds) was followed by a slower, steady degradation which also had to be minimized for accurate image presentation. Therefore, a model of the film behavior was based upon dye absorptivities and color measurements of slides as they were projected. The psychophysical experiments included a comparison between preference choices and memory matching to the CRT "original." Two CRT white points were evaluated: D93 and D65. The preference choices were, in fact, distinct from the selected matches. RLAB produced statistically superior matches over any other model for both white points. Model performance was image dependent. Occasionally, CIELAB or von Kries images were equivalent to RLAB. However, CIELAB and von Kries predictions ranged widely in their performance. Hunt's image predictions consistently gave the worst results. Interestingly, RLAB was also elected as the most acceptable choice: judged 'acceptable' in more than 2/3 of all cases, with a maximum approval of 89%.
Library of Congress Subject Headings
Information display systems; Image processing--Digital techniques; Colorimetry; Color vision
Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
Lester, Audrey A., "Color reproduction of CRT-displayed images as projected transparencies" (1994). Thesis. Rochester Institute of Technology. Accessed from
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