Abstract
Human beings view the world using sensitive light meters that operate on the basis of “Contrast Sensitivity”. “Contrast” can be defined simply as a ratio of adjacent luminance values and “Contrast Sensitivity” is a measure of how faded or washed-out an image can become before it is indistinguishable from a uniform field. It has been determined experimentally that the minimum discernible difference in grey-scale level that the human eye can detect is about 2% of full brightness [1, 2]. This outstanding Contrast Sensitivity allows the world around to be perceived in great detail; indeed, without contrast (and a means for achieving this via a variable-focus mechanism), human beings would effectively be rendered blind. The human eye, therefore, is drawn automatically to areas with high ratios of adjacent luminance – in simple terms, the world is viewed through edges created by contrast.
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Matts, P.J. (2010). The Measurement and Perception of Uneven Coloration in Aging Skin. In: Farage, M.A., Miller, K.W., Maibach, H.I. (eds) Textbook of Aging Skin. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89656-2_72
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DOI: https://doi.org/10.1007/978-3-540-89656-2_72
Publisher Name: Springer, Berlin, Heidelberg
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