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Eberhard effect : ウィキペディア英語版 | Eberhard effect In photographic science, the Eberhard effect, named after Gustav Eberhard, is a special case of two Mackie lines when narrow areas of high and low densities (usually lines approaching within 1 mm. thickness) cause the two Mackie lines to meet which results in an increased density of this small area.〔Applied Photography, Arnold et all, Focal Press, page 64〕 Eberhard published his findings in 1912〔D A Spencer, The Focal Dictionary of Photographic Technologies, page 185〕 or in 1926, 1931.〔The Focal Encyclopedia of Photography, Desk edition 1969, page 491〕 The Eberhard effect belongs to the family of photographic edge effects.〔D A Spencer, The Focal Dictionary of Photographic Technologies, page 186〕 ==References==
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