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The affect of pattern on gray tone area symbols: a psychophysical experiment Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/12579s82f

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  • Equal value gray scales are frequently employed by cartographers to choose gray tone area symbols. Several researchers have tried to quantify perceived gray tone as a function of percent area inked or reflectance but results have varied. The influence of pattern and texture on gray tone perception is considered a major cause in the variation of results. This research details the affect of pattern on gray tone perception. In the experiment, a pyschophysical based design, test subjects completed a seven step equal interval gray tone progression between various non-black and white anchor points using one of four testing patterns. Algorithms describing the relationship of perceived values to percent area inked were derived, showing in each case a psychophysical based logarithmic function. The perception of the two major pattern types used, dots and crosshatched patterns, yielded different perceptual results.
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