Equal contrast tint progressions for computer cartography Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8g84mq19s

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  • A psychophysical bisectioning experiment was performed to evaluate equal steps within tint progressions on a high resolution graphics terminal. In the bisectioning experiment each respondent partitioned a tint progression by interactively defining colors that were perceptually equidistant between two previously defined colors. Twenty test subjects performed the test on the hues of red, blue and green. Controlled replications allowed for a controlled experimental design within subjects. Viewing angle, viewing distance and lighting also were controlled to reduce experimental error. Physical color (CIE 1931) was used to define a tint variable which was a transformation of luminanace and the tristimulus variables. The tint variable was defined by principal component analysis based on the color coordinates. A psychophysical relationship between the tint variable and perceptual classes was examined. The results from this research indicated that tint is a nonlinear psychophysical function of color's physical attributes.
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