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#!/bin/sh
#
# Shrink the size of PDF files by adjust its quality using `gs` (GhostScript).
#
# Aaron LI
# 2013/09/18
#
case "$1" in
-[hH]*|--[hH]*)
printf "usage:\n"
printf " `basename $0` in=<input.pdf> out=<output.pdf> quality=<screen|ebook|printer|prepress> imgdpi=<img_dpi>\n"
exit 1
;;
esac
getopt_keyval() {
until [ -z "$1" ]
do
key=${1%%=*} # extract key
val=${1#*=} # extract value
keyval="${key}=\"${val}\""
echo "## getopt: eval '${keyval}'"
eval ${keyval}
shift # shift, process next one
done
}
getopt_keyval "$@"
if [ -z "${in}" ] || [ -z "${out}" ]; then
printf "Error: 'in' or 'out' not specified\n"
exit 2
fi
quality=${quality:-ebook}
imgdpi=${imgdpi:-120}
printf "# in: ${in}
# out: ${out}
# quality: ${quality}
# imgdpi: ${imgdpi}\n"
gs -dNOPAUSE -dBATCH -dSAFER \
-sDEVICE=pdfwrite \
-dCompatibilityLevel=1.4 \
-dPDFSETTINGS="/${quality}" \
-dEmbedAllFonts=true \
-dSubsetFonts=true \
-dColorImageDownsampleType=/Bicubic \
-dColorImageResolution=${imgdpi} \
-dGrayImageDownsampleType=/Bicubic \
-dGrayImageResolution=${imgdpi} \
-dMonoImageDownsampleType=/Bicubic \
-dMonoImageResolution=${imgdpi} \
-sOutputFile=${out} \
${in}
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