Drezha Image Magic

im-convert.sh

#!/bin/bash
#
# Covert phone images using Image Magic
#

while getopts ":h" opt; do
	case ${opt} in
		h )
			echo "Usage:"
			echo "    ${0##*/} -h              Display this help message"
			echo "    ${0##*/} <filename>      Convert image and create thumbnail using im"
			exit 0
			;;
		\? )
			echo "Invalid Option: -$OPTARG" 1>&2
			[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
			;;
		: )
			echo "Invalid Option: -$OPTARG requires an argument" 1>&2
			[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
			;;
	esac
done
shift $((OPTIND -1))

timestamp="$(date +"%Y%m%d%H%M%S")"
desktop=$HOME/Desktop
tempFile=$desktop/Temp.jpg
infile=$1

# Check a file has been specified in arguments
if [ -z "$infile" ]
then
	echo "Missing argument. Please use -h for help"
	[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
fi

# Check file to be converted exists
if [ ! -f "$infile" ]
then
	echo "Cannot find file: $infile"
	[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
fi

# Check that the convert command exists
convert -h >/dev/null 2>&1 || {
	echo >&2 "This script requires Imagic Magic to be installed. Aborting."
	[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
}

# Resizes images to 1,228,800 pixels (1280×960, assuming a standard lanscape iPhone image of 4032×3024 pixels)
convert ${infile} -resize 1228800@ -format jpg ${desktop}/img_${timestamp}.jpg

# Thumbnail creation – 76,800 pixels (320 x 240)
convert ${infile} -resize 76800@ -format jpg ${tempFile}

# Creates white background so that images are all the same size (320×320)
magick convert ${tempFile} -gravity center -background white -extent 330×330 ${desktop}/Thumbnail_${timestamp}.jpg

# Removes temp file
rm ${tempFile}