NAME

       jpegoptim - utility to optimize/compress JPEG/JFIF files.

SYNOPSIS

       jpegoptim [ options ] [ filenames ]

DESCRIPTION

       jpegoptim is used to optimize/compress jpeg files. Program supports lossless optimization,
       which is based on optimizing the Huffman tables. And so called "lossy" optimization  where
       in addition to optimizing Huffman tables user can specify upperlimit for image quality.

OPTIONS

       Options  may  be  either  the  traditional POSIX one letter options, or the GNU style long
       options.  POSIX style options start with a single ``-'', while GNU long options start with
       ``--''.

       Options offered by jpegoptim are the following:

       -d<path>, --dest=<path>
             Sets  alternative destination directory where to save optimized files (default is to
             overwrite the originals). Please note that unchanged files won't  be  added  to  the
             destination  directory.  This  means if the source file can't be compressed, no file
             will be created in the destination path.

       -f, --force
             Force optimization, even if the result would be larger than the original file.

       -h, --help
             Displays short usage information and exits.

       -m<quality>, --max=<quality>
             Sets the maximum image quality factor (disables lossless optimization mode, which is
             by default enabled). This option will reduce quality of those source files that were
             saved using higher quality setting.  While files that  already  have  lower  quality
             setting will be compressed using the lossless optimization method.

             Valid values for quality parameter are: 0 - 100

       -n, --noaction
             Don't really optimize files, just print results.

       -S<size>, --size=<size>
             Try  to  optimize  file  to given size (disables lossless optimizaiont mode). Target
             size is specified either in kilobytes (1 - n) or as percentage (1%  -  99%)  of  the
             original file size.

       -T<treshold>, --threshold=<treshold>
             Keep the file unchanged if the compression gain is lower than the threshold (%).

             Valid values for treshold are: 0 - 100

       -o, --overwrite
             Overwrite target file even if it exists (when using -d option).

       -p, --preserve
             Preserve file modification times.

       -q, --quiet
             Quiet mode.

       -t, --totals
             Print totals after processing all files.

       -v, --verbose
             Enables verbose mode (positively chatty).

       --all-normal
             Force all output files to be non-progressive. Can be used to convert all input files
             to progressive JPEGs when used with --force option.

       --all-progressive
             Force all output files to be progressive. Can be used to convert all input files  to
             normal (non-progressive) JPEGs when used with --force option.

       --strip-all
             Strip  all (Comment & Exif) markers from output file. (NOTE! by default only Comment
             & Exif markers are kept, everything else is discarded)

       --strip-com
             Strip Comment (COM) markers from output file.

       --strip-exif
             Strip EXIF markers from output file.

       --strip-iptc
             Strip IPTC markers from output file.

       --strip-icc
             Strip ICC profiles from output file.

BUGS

       When using --size option, resulting  file  is  not  always  exactly  the  requested  size.
       Workaround  is  to  re-run  jpegoptim  on the same file again which often will result file
       closer to target size.

SEE ALSO

       jpeginfo(1)

AUTHOR

       Timo Kokkonen <tjko@iki.fi>

COPYING

       Copyright (C) 1996-2013  Timo Kokkonen

       This program is free software; you can redistribute it and/or modify it under the terms of
       the  GNU  General  Public  License  as  published  by the Free Software Foundation; either
       version 2 of the License, or (at your option) any later version.
        This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU General Public License for more details.
        You should have received a copy of  the  GNU  General  Public  License  along  with  this
       program;  if  not,  write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
       Floor, Boston, MA  02110-1301, USA.