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3

For bitmap images (such as png) the files are copied as-is (and there is no way to change them in any way) and wrapped in a PDF object. Compression is done on-top as for other objects in a PDF file with the usual losless file compression of PDF. This is true for pdftex and xetex and probably still true for luatex.


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The closest answer I found to this question was through this: https://tug.org/TUGboat/tb26-1/hoeppner.pdf It does not explicitly state what I was asking but it says that PNG is supported through pdflatex. Read it for further details for your own specific problem.


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If file size does not matter, the best solution is arguably to upsample the image, for example using ImageMagick: convert small.png -filter point -scale 10000% large.png You can install ImageMagick on macOS using Homebrew: brew install imagemagick You can also use batch processing in the current directory using a loop like this: for f in *.png: ...



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