Fix PNG colorspace issues (vs. CSS colorspace) using pngcrush

remove_colorspace_from_png.rb

#!/usr/bin/env ruby

# this script is up to remove PNG colorspace information in order to display png's correctly along with css colors

# it requires pngcrush to be installed
#   $ sudo port install pngcrush

Dir[File.join(%w(public images ** *.png))].each do |pngfile|
  newfile = File.join(File.dirname(pngfile), 'new_' + File.basename(pngfile))
  `pngcrush -rem gAMA -rem cHRM -rem iCCP -rem sRGB #{pngfile} #{newfile}`
  `mv #{newfile} #{pngfile}`
end