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Re:Show HN: Make Your PDF Look Scanned by doc_gunthrop on Tuesday May 12, 2020 @03:35PM (#23158654)
It looks like what is being used for the transformation is:

1) set to grayscale (optional), 2) add blur, 3) slight rotational tilt, 4) add gaussian blur (?)

You can go one further by randomly adding tiny artifacts (ie. specks) to add even more realism. Maybe even a simulated crease in a corner.

Re:Show HN: Make Your PDF Look Scanned by baicunko on Tuesday May 12, 2020 @04:38PM (#23159419)
I will check regarding artifact. Also someone else mentioned to add random rotational tilt per page to ensure it looks more "legit"