Turn a PDF into a series of images

imagerise.sh

#!/bin/bash

if [[ $# == 1 ]]; then
    fn_input=$1
else
    echo "usage: $0 <fn_input>"
    exit 255
fi

rm -rf tmp
mkdir -p tmp

fn_output="${fn_input}.img.pdf"

cd tmp
rm -f *.jpg *.png *.png.pdf 
cd -

rm -f $fn_output

convert -depth 8 -density 256 -quality 100  $fn_input -resize 100% tmp/${fn_input}.tmp.%03d.png
cd tmp
ls -1 *.png  | xargs -I{} convert {} {}.pdf
pdftk *.png.pdf cat output $fn_output
cd - 
cp tmp/$fn_output ./