Zipped jpeg files to CBZ file for Kobo Glo.

zip2cbz.sh

#!/bin/bash -ex
# zip2cbz.sh
# Written by Takashi UNO
# require: zip, ImageMagick

if [ $# -ne 1 ]; then
  echo "USAGE: `basename $0` hogehoge.zip"
	exit 1
fi

for cmd in zip unzip convert ; do
	if [ ! -x "`which $cmd`" ]; then
		echo "command $cmd is not found."
		exit 1
	fi
done

if [ ! -f "$1" ]; then
	echo "$1: file not exist."
	exit 1
fi

TMPDIR="/var/tmp/`basename "$1" .zip`"
# TMPDIR="${1%.zip}"
trap 'rm -rf "${TMPDIR}"' EXIT
mkdir -p "${TMPDIR}/unzip"
mkdir "${TMPDIR}/png"
unzip -jq "$1" -d "${TMPDIR}/unzip"
OPTIPNGOPTIONS="-quiet"
SIZE="758x1024"

pushd "${TMPDIR}/unzip" >/dev/null
if [ ! -x `which parallel` ]; then
	for src in *.jpg ; do
		convert "$src" \
		-type grayscale \
		# -sharpen 5 \
		-fuzz 50% -trim \
		-linear-stretch 2%x2% \
		-bordercolor white -border 2%x2% \
		png:- | convert - -depth 4 -resize ${SIZE} ../png/"${src%.jpg}.png"
		test -x `which optipng` && optipng ${OPTIPNGOPTIONS} ../png/"${src%.jpg}.png"
	done
else
	ls *.jpg | parallel -j4 "convert {} \
		-type grayscale \
		-fuzz 50% -trim \
		-linear-stretch 2%x2% \
		-bordercolor white -border 2%x2% \
		png:- | convert - -depth 4 -resize $SIZE ../png/{.}.png"
	test -x `which optipng` && optipng ${OPTIPNGOPTIONS} ../png/*.png
fi
popd >/dev/null
zip -jqr "${1%.zip}.cbz" "${TMPDIR}/png"