# File lib/paperclip/frame_grab.rb, line 62
    def transformation_options
      if current_geometry
        scale, crop = current_geometry.transformation_to(target_geometry, crop?)
        trans = []
        trans << "-resize" << %["#{scale}"] unless scale.nil? || scale.empty?
        trans << "-crop" << %["#{crop}"] << "+repage" if crop
        trans.join(" ")
      end
    end