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after_attachment_saved do |photo|
  image=MiniMagick::Image.from_file(photo.full_filename)
  height=image["height"]
  width=image["width"]
  if height<100 or width<100
    image.resize "100x100!"
  else
    image.combine_options do |c|
      c.resize height>100 ? "100x" : "x100"
      c.gravity "Center"
      c.crop("100x100+0+0")
    end
  end
  image.write(photo.full_filename)
end