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