"image/jpeg") format_hint="jpeg:" ;;
    "image/bmp"|"image/x-windows-bmp"|"image/x-ms-bmp") format_hint="bmp:" ;;
    "image/vnd.adobe.photoshop"|"image/photoshop"|"application/x-photoshop"|"application/photoshop") format_hint="psd:" ;;
  esac
  ${im_cmd} -thumbnail ${image_size} "${format_hint}${target_file}" "${output_file}"
elif [[ x"${cmd_type}" = "x" ]] ; then
  echo "No filetype."
  exit 1
else
  echo "Unsupported type: ${cmd_type}"

        case "image/png" -> ".png";
        case "image/bmp", "image/x-windows-bmp", "image/x-ms-bmp" -> ".bmp";
        case "image/vnd.adobe.photoshop", "image/photoshop", "application/x-photoshop", "application/photoshop" -> ".psd";
        default -> "";
        };
    }