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It seems to be deeply rooted in photographic lore that a card reflecting 18% of white light is perceived as 50% gray. For this to be true, the power to which the (normalized)measured light must be raised to give the perceived light would be 1/2.5. Yet, in the literature (specifically at www.lutron.com), the perceived power is given as the square root of the measured power (1/2). The latter gives a perceived gray level of 50% for a measured power of 25%. Which relation is authentic?
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