自炊PDFをKindle向け16階調グレースケールにしてサイズを小さくする

pdfcompress

#!/bin/sh
src=`basename "$1" .pdf`

mkdir tmp

pdftk "${src}.pdf" dump_data output meta.txt

pdfimages "${src}.pdf" "tmp/${src}"

cd tmp
for f in *.ppm; do
   tmp=`basename "$f" .ppm`
   convert "${tmp}.ppm" -depth 4 -type Grayscale "${tmp}.png"
   sam2p -j:quiet "${tmp}.png" "${tmp}.pdf"
   rm "${tmp}.ppm" "${tmp}.png"
done
cd ..

pdftk tmp/*.pdf cat output tmp.pdf
pdftk tmp.pdf update_info meta.txt output "${src}.out.pdf"
rm -rf tmp.pdf tmp meta.txt