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#!/bin/sh
#
# Copyright (c) 2019 Aaron LI <aly@aaronly.me>
# MIT License
#
# Convert a set of JPEG files to a multipage PDF using Ghostscript and
# ImageMagick (requires the "identify" command).
#
# Credit: pipitas@gmail.com
#
if [ $# -lt 2 ]; then
echo "usage: ${0##*/} output.pdf 1.jpg ..."
exit 1
fi
outfile="$1"
shift
fcmd=$(mktemp)
N=$#
i=0
echo "Total images: ${N}"
while [ -n "$1" ]; do
f="$1"; shift; i=$((${i} + 1))
echo -n "${i}.."
dim=$(identify -format "%[fx:(w)] %[fx:(h)]" "${f}")
echo "<</PageSize [${dim}]>> setpagedevice (${f}) viewJPEG showpage" \
>> ${fcmd}
done
gs \
-sDEVICE=pdfwrite \
-dPDFSETTINGS=/prepress \
-o "${outfile}" \
viewjpeg.ps \
-f ${fcmd}
rm -f ${fcmd}
echo "Output file: ${outfile}"
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