Answer by Ilya Zakharevich for Change color in finished pdf file
Yesterday, I have been fighting a similar problem: while xelatex of TeXLive2018 was producing PDF files without hard-stored blacks, it turned out that TeXLive2021 produces files with immutable blacks....
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Answer by Heiko Oberdiek for Change color in finished pdf file
Easy case with uncolored PDF and pdfTeX (unhappily very seldom):The PDF file contains some drawings without explicit color settings andthe image will be included by the pdftex driver of the graphics...
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Suppose I have a finished PDF file, say a figure generated from some software, where the ink is black. I would include it in a document. Suppose I want to include it in a beamer presentation with black...
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