how to revert iphone optimization png which in the ipa file

before you run this script, you should had ruby env and Xcode.
1. save it with name ‘png’
2. chmod +x png
useage: ./png [ipa file path]

#!/usr/bin/env ruby -wKU
require 'rubygems'
ipa = ARGV.first
puts "useage:png " and return if !ipa or ipa.end_with?("ipa")
name = File.basename(ipa, ".ipa")
# create output folder in you desktop
output = "#{ENV['HOME']}/Desktop/#{name}"
system %Q{mkdir -p "#{output}" && unzip "#{ipa}" -u -d "#{output}"}
Dir.glob(File.join(output, "**", "*.png")).each do |f|
  system %Q{/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush -revert-iphone-optimizations -q "#{f}" "#{File.join(output ,File.basename(f))}"}
end
system %Q{find '#{output}' -type f -not \\( -iname "*.png" -or -iname "*.jpg" -or -iname "*.jpeg" \\) -delete}
system %Q{open "#{output}" -a finder}