Usage: /usr/bin/jxltran INPUT OUTPUT [OPTIONS...]
 INPUT
    The JPEG XL input file.
 OUTPUT
    The JPEG XL output file.

File format options:
 --pack
    Pack a JPEG XL codestream into a file in the container file format.
 --extract
    Extract the JPEG XL codestream from a file in the container file format.

 -h, --help
    Prints this help message. All options are shown above.