diff options
| -rwxr-xr-x | cli/pdf-compress.sh | 126 |
1 files changed, 77 insertions, 49 deletions
diff --git a/cli/pdf-compress.sh b/cli/pdf-compress.sh index 3551fce..bd4fd03 100755 --- a/cli/pdf-compress.sh +++ b/cli/pdf-compress.sh @@ -1,57 +1,85 @@ #!/bin/sh # -# Shrink the size of PDF files by adjust its quality using `gs` (GhostScript). +# Copyright (c) 2013,2019 Aaron LI +# MIT License # -# Aaron LI -# 2013/09/18 +# 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 -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 + 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}" \ + "${infile}" } -getopt_keyval "$@" - -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}" \ - -dPrinted=false \ - -dEmbedAllFonts=true \ - -dSubsetFonts=true \ - -dColorImageDownsampleType=/Bicubic \ - -dColorImageResolution=${imgdpi} \ - -dGrayImageDownsampleType=/Bicubic \ - -dGrayImageResolution=${imgdpi} \ - -dMonoImageDownsampleType=/Bicubic \ - -dMonoImageResolution=${imgdpi} \ - -sOutputFile=${out} \ - ${in} +main "$@" |