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December 13, 2020 14:31
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Compress pdf
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#!/bin/sh | |
# use with | |
#chmod +x ./shrinkpdf.sh | |
# ./shrinkpdf.sh ./testin.pdf ./testout.pdf | |
# http://www.alfredklomp.com/programming/shrinkpdf | |
# Licensed under the 3-clause BSD license: | |
# | |
# Copyright (c) 2014-2019, Alfred Klomp | |
# All rights reserved. | |
# | |
# Redistribution and use in source and binary forms, with or without | |
# modification, are permitted provided that the following conditions are met: | |
# 1. Redistributions of source code must retain the above copyright notice, | |
# this list of conditions and the following disclaimer. | |
# 2. Redistributions in binary form must reproduce the above copyright notice, | |
# this list of conditions and the following disclaimer in the documentation | |
# and/or other materials provided with the distribution. | |
# 3. Neither the name of the copyright holder nor the names of its contributors | |
# may be used to endorse or promote products derived from this software | |
# without specific prior written permission. | |
# | |
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
# POSSIBILITY OF SUCH DAMAGE. | |
shrink () | |
{ | |
gs \ | |
-q -dNOPAUSE -dBATCH -dSAFER \ | |
-sDEVICE=pdfwrite \ | |
-dCompatibilityLevel=1.3 \ | |
-dPDFSETTINGS=/screen \ | |
-dEmbedAllFonts=true \ | |
-dSubsetFonts=true \ | |
-dAutoRotatePages=/None \ | |
-dColorImageDownsampleType=/Bicubic \ | |
-dColorImageResolution=$3 \ | |
-dGrayImageDownsampleType=/Bicubic \ | |
-dGrayImageResolution=$3 \ | |
-dMonoImageDownsampleType=/Subsample \ | |
-dMonoImageResolution=$3 \ | |
-sOutputFile="$2" \ | |
"$1" | |
} | |
check_smaller () | |
{ | |
# If $1 and $2 are regular files, we can compare file sizes to | |
# see if we succeeded in shrinking. If not, we copy $1 over $2: | |
if [ ! -f "$1" -o ! -f "$2" ]; then | |
return 0; | |
fi | |
ISIZE="$(echo $(wc -c "$1") | cut -f1 -d\ )" | |
OSIZE="$(echo $(wc -c "$2") | cut -f1 -d\ )" | |
if [ "$ISIZE" -lt "$OSIZE" ]; then | |
echo "Input smaller than output, doing straight copy" >&2 | |
cp "$1" "$2" | |
fi | |
} | |
usage () | |
{ | |
echo "Reduces PDF filesize by lossy recompressing with Ghostscript." | |
echo "Not guaranteed to succeed, but usually works." | |
echo " Usage: $1 infile [outfile] [resolution_in_dpi]" | |
} | |
IFILE="$1" | |
# Need an input file: | |
if [ -z "$IFILE" ]; then | |
usage "$0" | |
exit 1 | |
fi | |
# Output filename defaults to "-" (stdout) unless given: | |
if [ ! -z "$2" ]; then | |
OFILE="$2" | |
else | |
OFILE="-" | |
fi | |
# Output resolution defaults to 72 unless given: | |
if [ ! -z "$3" ]; then | |
res="$3" | |
else | |
res="72" | |
fi | |
shrink "$IFILE" "$OFILE" "$res" || exit $? | |
check_smaller "$IFILE" "$OFILE" |
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