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#!/bin/sh
#
# Copyright (c) 2013,2019 Aaron LI
# MIT License
#
# Compress a PDF file by adjust its quality using GhostScript.
#
# Credits:
# * https://www.ghostscript.com/doc/current/Use.htm
# * https://www.ghostscript.com/doc/current/VectorDevices.htm
#
usage() {
cat << _EOF_
Compress a PDF file by adjust its quality using GhostScript.
usage:
${0##*/} [-d dpi] [-l level] [-s settings] <infile> <outfile>
options:
-d dpi : image dpi to be downsampled to (default: 150)
-l level : PDF compatibility level (default: 1.5)
-s settings : predefined settings (default: ebook)
valid choices: screen, ebook, printer, prepress, default
_EOF_
exit 1
}
main() {
local dpi=150
local level=1.5
local settings=ebook
local infile outfile
while getopts :hd:l:s: opt; do
case ${opt} in
h)
usage
;;
d)
dpi=${OPTARG}
;;
l)
level=${OPTARG}
;;
s)
settings=${OPTARG}
;;
\?)
echo "Invalid option -${OPTARG}"
usage
;;
:)
echo "Option -${OPTARG} requires an argument"
usage
;;
esac
done
shift $((${OPTIND} - 1))
if [ $# -ne 2 ]; then
usage
fi
infile="$1"
outfile="$2"
gs -dQUIET -dNOPAUSE -dBATCH -dSAFER \
-sDEVICE=pdfwrite \
-dCompatibilityLevel=${level} \
-dPDFSETTINGS=/${settings} \
-dPrinted=false \
-dEmbedAllFonts=true \
-dSubsetFonts=true \
-dFastWebView=true \
-dColorImageDownsampleType=/Bicubic \
-dColorImageResolution=${dpi} \
-dGrayImageDownsampleType=/Bicubic \
-dGrayImageResolution=${dpi} \
-sOutputFile="${outfile}" \
"${infile}"
}
main "$@"
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