gistfile1.rbx

require 'rubygems' 
require 'RMagick' 
 
1.upto 50 do |idx| 
  file = Dir["#{idx}/*.*"].first                                                                                                                                       
  p file 
  if file 
    img = Magick::ImageList.new(file).first
    img.change_geometry('600x600') do |c, l, i|  
      i.resize! c, l 
      i.write File.join("#{idx}", 'display', File.basename(file))
    end 
    
  end 
end