In this tutorial you will learn how to use the effect that is useful for creation realistic rendering of irregular and corrupted surfaces in gimp. It is based on the observation that rust and corrosion, for example, begin at random “nucleation” sites and propagate in a random fashion. To simulate this process digitally, I have explored the idea of selective removal of portions of a randomly generated plasma field using Select by Color. In this tutorial, we develop an example that illustrates the technique in its most basic form.
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