> you can do it in LaTeX pretty easily: https://tex.stackexchange.com/questions/94523/simulate-a-sca...
Ironically, despite being hosted on tex.stackexchange.com, all of the answers use ImageMagick, Photoshop, or Windows 10/Adobe Acrobat.
Re:Show HN: Make Your PDF Look Scanned
by _emacsomancer_ on Tuesday May 12, 2020 @06:52PM
(#23161093)
Interestingly, there are LaTeX packages for coffee stains[1] and to simulate the variability of an actual typewriter[2]. I suppose both of these involve discrete objects (the coffee stain, individual characters) and photocopy/scan effects involve 'fuzzing' of the whole image, rather than any particular element, and TeX isn't really set up for the former.
[1] http://hanno-rein.de/archives/349
[2] http://mirrors.concertpass.com/tex-archive/macros/luatex/lat...
It's interesting that the problem they had was with the signature. You can very easily make a handwritten signature on an iPad. I don't see how there's any practical way to tell the difference between a high-quality, handwritten signature done on an iPad with either a finger or an Apple Pencil and a scanned signature done with a pen.
Are you sure that's not just some excuse they gave you?