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Whitelisted phrase (-1): it worked
Whitelisted phrase (-1): worked for me
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I have also struggled with this problem.

Finally, I found that if I drew an image with dpi meta, the image in the pdf generated by Microsoft Print To PDF would not be scaled.

There are a few libraries that can help do this (parse the image and edit the meta in it), but they're all too big. I tried to write two programs to add dpi meta to png and jpg. Maybe there are some bugs, but it worked for me.