sizer.rb

require 'rubygems'
require 'mini_magick'

image_path ="/Users/mauriciosilva/Projects/akqa/audi/audi_mobile/public/images/360" 

Dir.foreach(image_path) do |f|
  next if f == '.' or f == '..' or f == 'sizer.rb' or f == '.DS_Store'

  img = MiniMagick::Image.new(f)

  w, h = img['%w %h'].split

  puts "current size is #{w}x#{h}"
  img.thumbnail "480x320"
  w1, h1 = img['%w %h'].split
  puts "current size is #{w1}x#{h1}"
end