Covert PDF to flat PDF

convert-to-flat-pdf.sh

#!/bin/bash

FILE=$1
OUTPUTFILE=$2

TEMPDIR=`mktemp -d`
gs -q -dSAFER -dBATCH -dNOPAUSE -sDEVICE=jpeg -dJPEGQ=95 -r600 -o $TEMPDIR/out-%05d.jpg $FILE

SIZES=(`identify -format "%W-%H\n" $FILE`)

I=0
for x in $TEMPDIR/*.jpg; do
  IFS=- read -a size <<< "${SIZES[$I]}"
  gs -q -o $x.pdf -sDEVICE=pdfwrite -r300 -dDEVICEWIDTHPOINTS=${size[0]} -dDEVICEHEIGHTPOINTS=${size[1]} -dPDFFitPage /usr/share/ghostscript/9.10/lib/viewjpeg.ps -c "($x) viewJPEG"
  let I++
done

pdftk $TEMPDIR/*.pdf cat output $OUTPUTFILE

rm -R $TEMPDIR