scanned_pdf.sh

#!/bin/bash

# Make a PDF look scanned. 
# Extracted from https://github.com/baicunko/scanyourpdf and modified for smaller output files (compression lower density).

# Project requires ImageMagick and GhostScript. This will do the trick on Ubuntu:

# sudo apt-get install ghostscript
# sudo apt-get install imagemagick

# This should work on macOS with Homebrew:

# brew install ghostscript
# brew install imagemagick

# If you're getting a PDF security error see https://stackoverflow.com/questions/52998331/imagemagick-security-policy-pdf-blocking-conversion

INPUT_FILE=$1
convert -density 150 ${INPUT_FILE} -colorspace 'gray' +noise Gaussian -rotate 0.5 -depth 2 scanned_${INPUT_FILE}