test.bash

#!/bin/bash

# Usage: script pdf1 pdf2

convert -density 96 $1 -colorspace RGB a.png
convert -density 96 $2 -colorspace RGB b.png

# For output files
for i in b-*.png; do
    out=$(magick compare -metric PSNR ${i} a${i:1} diff.png 2>&1)
    if [[ "$out" != "inf" ]]; then
        echo "Error, difference in page ${i:2:${#i}-6} diff.png"
        break
    fi
done

rm -rf b-*.png a-*.png