A cropping script for iOS screenshots

ios-status-bar-crop.sh

#!/bin/sh
#
# A cropping script for iOS screenshots
#
# This shell script crops an iOS screenshot without the status bar. It
# automatically detects a display size of a screenshot, and cuts its status bar
# using ImageMagick. It currently supports portrait screenshots of 3.5 and 4
# inch iPhone.
#
# Usage:
#     $ ./status-bar-crop.sh foo.png
#

# Check arguments
if [ $# -lt 1 ]; then
    echo "Invalid arguments" 1>&2
    echo "Usage: $0 foo.png" 1>&2
    exit 1
fi

# Check ImageMagick
if [ ! `which mogrify` ]; then
    echo "ImageMagick is not found" 1>&2
    exit 1
fi

# Cropping
for IMG in `ls $*`; do
    WIDTH=`identify -format '%w' -quiet $IMG`
    HEIGHT=`identify -format '%h' -quiet $IMG`
    if [ $WIDTH -eq 640 -a $HEIGHT -eq 960 ]; then
        # 3.5 inch
        mogrify -crop 640x920+0+40 -quiet $IMG
        echo "Cropped $IMG"
    elif [ $WIDTH -eq 640 -a $HEIGHT -eq 1136 ]; then
        # 4 inch
        mogrify -crop 640x1096+0+40 -quiet $IMG
        echo "Cropped $IMG"
    fi
done