give polarized effect to a photo

polarize_photos.rb

require 'RMagick'; include Magick
def polarize_photo(photo_url, photo_caption, pointsize = 14, font_family = 'Rufscript')
  p = Image.read(photo_url)[0]
  p[:Caption] = photo_caption
  
  r = (-10..10).to_a[rand(20)]
  p.polaroid(r) do
    self.pointsize = pointsize
    self.font_family = font_family
  end
end