NAME

       lepton - tool to compress JPEGs losslessly

SYNOPSYS

       lepton [switches] input_file [output_file]

DESCRIPTION

       Lepton is a tool and file format for losslessly compressing JPEGs by an average of 22%.

       This can be used to archive large photo collections, or to serve images live and save 22%
       bandwidth.

OPTIONS

       -version
           Version of lepton codec

       -revision
           Source revision of lepton binary

       -unjailed
           Do not jail this process (use only with trusted data)

       -singlethread
           Do not clone threads to operate on the input file

       -maxchildren
           Max codes to ever spawn at the same time in socket mode

       -preload
           Preload decoding code

       -unkillable
           Ignore SIGTERM and SIGQUIT after alarm timer is set

       -allowprogressive
           Allow progressive jpegs through the compressor

       -fork
           Serve requests on a series of pipes [deprecated]

       -zlib0
           Instead of a jpg, return a zlib-compressed jpeg

       -timebound=<>ms
           For -socket, enforce a timeout since first byte received

       -trunc=<>
           Truncate input file to N bytes and do not read further

       -memory=<>M
           Upper bound on the amount of memory allocated by main

       -threadmemory=<>M
           Bound on the amount of memory allocated by threads

       -hugepages
           Allocate from the hugepages on the system

       -avx2upgrade
           Try to exec <binaryname>-avx if avx is available

       -injectsyscall={1..4}
           Inject a "chdir" syscall & check SECCOMP crashes

       -socket
           Serve requests on a Unix Domain Socket

       -socket=<name>
           Path to socket (otherwise random path used and printed)

       -listen
           Serve requests on a TCP socket on port 2402

       -listen=<port>
           Serve requests on a TCP socket on port <port>

       -zliblisten
           Serve requests on a TCP socket oi port 2403

       -zliblisten=<port>
           Serve requests on a TCP socket on port <port>

       -recodememory=<>M
           Check that a singlethreaded recode only uses <>M mem

AUTHOR

       This manual page was written by ChangZhuo Chen <czchen@debian.org> for the Debian
       GNU/Linux system (but may be used by others).

                                            02/05/2018                                  LEPTON(1)