How can I punch cut an alphanumeric character, say, "A" out of an image, so that I have only the interior of a large bold "A" showing the contents of the image?
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\includegraphics? There really isn't any reason to spend time computing this during compilation, surely? – cfr Aug 23 '17 at 03:58transparency group=knockout](see section 23.5 of the TikZ manual) – Chris H Aug 23 '17 at 09:29