Script to compress large bitmap PDFs

gnux_pdfnovector.sh

#!/bin/sh

INPUT="$1"
TMPDIR=`mktemp -d`

# TODO: READ ALSO https://gist.github.com/yura/670974

echo "Input file: $INPUT"

echo "Converting PDF to images"
#convert -density 150 -quality 100 -colors 256 "$INPUT" "$TMPDIR/hires-%03d.png"
convert -density 200 -quality 100 -colors 512 "$INPUT" "$TMPDIR/hires-%03d.png"

echo  "Compressing & merging images to flat PDF"
convert -compress jpeg -quality 75 "$TMPDIR/hires-"*.png "$TMPDIR/flat_${INPUT}"
echo "done."

echo "Compressing PDF"

# Compression 1
pdftk "$TMPDIR/flat_${INPUT}" output "$TMPDIR/compress_${INPUT}" compress
# LOSSLESS
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH -sOutputFile="re_${INPUT}" "$TMPDIR/compress_${INPUT}"
rm -fr "$TMPDIR"

echo "Done"