Mackie line
Is an effect sometime found on a negative or print, in which a light line forms along the boundaries of the darkest image areas.
Mackie Lines. -
Even in photography, there is an excitatory/inhibitory edge effect that mimics the Sabatier border line.
In solarisation, not only are parts of the image reversed in tone but a thin line is generated around areas of contrasting tone, called a Mackie line.
 See also: Negative, Developer, Solarization, Line, Light
  
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