Day 42: Tonal Contours

If a photo is reduced to a limited number of tones then those tones meet at the “contour” line along which an object or a face has the same tone, and each “area” covered by a single tone is covering the area in which the tonal values fall between the upper and lower bounds. This photographic process used to be called “Solarisation”, these days it must be possible with a smartphone app. I must find one.

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