PDF to JPG with watermark

#!/bin/bash
 
set -x
 
# $1: filename of the PDF
# $2: the prefix after printout
 
echo "Transforming PDF ${1} to ${2}-printout/${2}..."
 
rm -rf ${2}-printout && mkdir ${2}-printout
 
pdftoppm -jpeg -r 128 $1 ${2}-printout/$2
 
for pic in ${2}-printout/*.jpg; do
    composite -dissolve 30% -gravity south ../.layouts/notes-watermark.png $pic ${pic//.jpg}-marked.jpg
    rm -f $pic
done
 
set +x
 
for pic in ${2}-printout/*-marked.jpg; do
    echo "![](${pic})"
done