when :thumb
      if geometry.width.to_i >= 100
        thumb_geometry = Paperclip::Geometry.from_file(picture_file.picture.path(:thumb))
        return image_tag picture_file_path(picture_file, :format => picture_file.extname, :size => :thumb), :alt => "*", :width => thumb_geometry.width.to_i, :height => thumb_geometry.height.to_i
      end