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Tutorial: the paradox photo (the “Droste effect”) with Gimp and MathMap

Today's tutorial is a cross between photography, graphic and Mathematics. Photography because we start from a real photo, and a good photograph is the beginning of a good job, graphic because of the various tweaks that as we make any and Mathematics because the effect scomoderemo today follows strict mathematical rules, nothing is left to chance. For this tutorial we will use Gimp and its plugin MathMap.