A Cartographic Study of Equal Value Gray Scales for Use With Screened Gray Areas

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Abstract
The determination of the functional relationship between the tone of a screened gray area and its perceived value is not of interest only to cartographers. This relationship has been studied by psychologists and others for over two centuries. Various experimental methods have been employed in the past to define the relationship, with each form of experiment giving differing results. The scale resulting from this author's testing program involving screened gray areas was very similar to the Munsell equal value scale. The effect of age, sex, experience, wearing of glasses, and the background on which the gray areas were viewed on the form of the gray scale was studied. The viewing background was found to be the only factor which significantly affected the form of the equal value scale.

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