def show
      @image = Picturesque::Image.find(params)
      @file = @image.process(params.slice(:size, :quality, :format))

      setup_canonical_link

      expires_in 3.years, public: @file
      send_file @file.path, disposition: Picturesque::Image::DISPOSITION
    end
def show
      @image = Picturesque::Image.find(params)
      @file = @image.process(params.slice(:size, :quality, :format))

      setup_canonical_link

      expires_in 3.years, public: @file
      send_file @file.path, disposition: Picturesque::Image::DISPOSITION
    end
GET /:id/(:size)(/:quality)(/:slug).(:format)