    # File lib/ramaze/contrib/sequel/image.rb, line 177
        def generate_thumbnails
          FileUtils.mkdir_p(public_path)

          sizes, algorithm = conf.values_at(:sizes, :algorithm)

          ImageScience.with_image(original) do |img|
            Ramaze::Log.debug "Process original: #{original}"

            sizes.each do |name, args|
              out = public_file(name)
              Ramaze::Log.debug "Generate Thumbnail: #{out}"

              img.send(algorithm, *args) do |thumb|
                thumb.save(out)
              end
            end
          end
        end