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Mackie line : ウィキペディア英語版
Mackie line
In photographic science, a Mackie line is an adjacency or border effect created during development, at the border between areas of high and low densities.
During developing, developer remains relatively fresh in an area of low density as less developing takes place and consequently, developer oxidation product concentration remains relatively low. At the border between high and low density areas the relatively fresh developer diffuses laterally into the high density area and causes there a continuation of development. The result is an increased border density of the high density area.〔D A Spencer, The Focal Dictionary of Photographic Technologies, page 362〕
The Mackie line effect belongs to the family of edge effects. Edge effects include: Gelatin-, Ross-, Fringe-, Eberhard- and Kostinsky effects.〔D A Spencer, The Focal Dictionary of Photographic Technologies, pages 10, 60, 185, 186, 255, 333〕
==References==

It is worth noting that Mackie heard many different theories to explain these lines (for over 30 years) and did NOT like any of them. Now that people observe these lines in the digital world, the chemical reasons for these lines may be only part of the story. There may also be quantum effects of light transmission involved, and people have developed different methods of scanning documents so as to minimize these effects in the digital world. Net: Mackie lines and different types of edge effects are far from a completely understood even today, and the level of the theory to apply may depend on the application at hand.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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