mkdir ~/bin
cd ~/bin
tar xzvf ~/Downloads/ImageMagick-x86_64-apple-darwin11.3.0.tar.gz
ln -s ~/bin/ImageMagick-6.7.5 ~/bin/ImageMagick

# <imageMagick>
export MAGICK_HOME="$HOME/ImageMagick"
export PATH="$MAGICK_HOME/bin:$PATH"
export DYLD_LIBRARY_PATH="$MAGICK_HOME/lib/"
# </imageMagick>

source ~/.bash_profile

#!/bin/sh
# createiOSWebappImages.sh by fns@fns.hu
# created 2012.06.03
# lmdate 2012.06.03
function createImages() {
	ext=".png" # default source & target extension
	args=( "$@" ) # all the paameters in an array
	ac=${#args[@]} # parameter array length
	p=${args[0]} # basePath: 1st parameter
	bf=$p/${args[1]}$ext # baseFile: 2nd parameter
	f=${args[2]} # iconFile: 3rd parameter
	for (( i=3; i<$ac; i++ )) # first 3 parameters were not the member of our resizer array so start from 3rd one
	do
		str=${args[$i]} #get array element
		len=${#str} #get length of string
		xpos=`echo "$str" | sed -n "s/[x].*//p" | wc -c` # get "x" pos within string
		w=${str:0:(xpos-1)} #substr
		h=${str:(xpos):(len-xpos)} #substr
		f2="$p/$f$str".png
		echo "Resizing image; source = $bf new_size = $str target = $f2"
		convert $bf -resize $str -gravity center -extent $str $f2
	done
} # createImages()
basePath="." # location of source & target files
baseFile="ios-webapp-baseimage" # source file
iconFile="apple-touch-icon" # target file prefix
iconSizes=( 57x57 72x72 114x114 144x144 ) # target file sizes in an array
startupFile="apple-touch-startup-image" # target file prefix
startupSizes=( 320x460 640x920 768x1004 768x1024 1536x2008 1496x2048 ) # target file sizes in an array
createImages $basePath $baseFile $iconFile "${iconSizes[@]}"
createImages $basePath $baseFile $startupFile "${startupSizes[@]}"