Solarization, first copy Solarization, second copy
Solarization is an artistic effect in photography. A film or photographic paper is briefly exposed to light during chemical development, reversing the brighter tones of the image and creating a white rim around previously dark areas.
Back in the 1950s, I worked with solarization in my darkroom. Here is an example and a step-by-step description of how I did it.
Three examples of solarization of a digital photograph done with GIMP
Country alley County alley Fiery glacier Fiery glacier Power line Power line

Images copyright 1956 - 2021 by G.W.Schnell. All rights reserved.