def put_sticker(sticker, x, y)
  photo_path = photo.file_path
  loot_image = Magick::Image::read(photo_path)[0]
  sticker_image = Magick::Image::read(sticker)[0]
  loot_image = loot_image.composite(sticker_image, x, y, Magick::AtopCompositeOp)
  out = photo_path.sub(/\./, "-sticker.")
  loot_image.format = "PNG"
  loot_image.write(out)
end