Andrey Zhuravlev - Sharpening - Basic Principles and Techniques
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https://liveclasses.ru/course/graphics/sharpening_basic_principles/

Why is sharpening necessary? What principles underlie this increase? What are the techniques for sharpening and what problems they cause? And, of course, how to overcome these problems? Here is a circle of questions that will be carefully worked out in the class of Andrei Zhuravlev, who has systematized for you a huge layer of relevant knowledge. Dan Margulis, Bruce Fraser - this is not just copyrights to bring any methods, but almost always - the result of their experienced practical understanding.