Provided by: jpegoptim_1.4.3-1_amd64 bug

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.

       NOTE!  By  default jpegoptim modifies the input files (if they are optimized), to preserve original files
       use option -d to specify alternate directory for saving the optimized files to.

       Only normal files are optimized (symbolic links and special files are skipped).   Also,  any  other  hard
       links to the file being optimized (as created using link(2)) are unaffected.

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 optimization mode). Target size is specified
             either in kilobytes (1 - n) or as percentage (1% - 99%) of the original file size.

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

             Valid values for threshold are: 0 - 100

       -b, --csv
             Print progress info in CSV format.

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

       -p, --preserve
             Preserve file modification times.

       -P, --preserve-perms
             Preserve file permissions (owner/group) by overwriting the original file.  This  is  slightly  less
             safe  than  the default mode of operation (where new file is first saved as temporary file and then
             renamed over the original file).  In this  mode  a  backup  of  the  original  file  is  made  with
             .jpegoptim.bak  extension,  and  this file is removed after the original file has been successfully
             replaced.  NOTE! if running jpegoptim as root there is generally no need to  use  this  option,  as
             jpegoptim is able to preserve file permissions when run by root in default mode.

       -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 normal (non-progressive) JPEGs
             input files to progressive when used with --force option.

       -s, --strip-all
             Strip  all  markers  from output file. (NOTE! by default only Comment & Exif/IPTC/PhotoShop/ICC/XMP
             markers are kept, everything else is discarded).  Output JPEG still likely will contains one or two
             markers  (JFIF  and  Adobe  APP14)  depending on colorspace used in the image, as these markers are
             generated by the libjpeg encoder automatically.

       --strip-none
             Preserve "all" markers in the image. This will leave all markers untouched  in  the  image,  except
             JFIF (APP0) and Adobe (APP14) markers as those get regenerated by the libjpeg library.

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

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

       --strip-iptc
             Strip IPTC / Adobe Photoshop (APP13) markers from output file.

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

       --strip-xmp
             Strip XMP profiles from output file.

       --stdout
             Send  output  image  to  standard output. Note, if optimization didn't create smaller file than the
             input file, then no output (image) is sent to standard output. (Option -f  can  be  used  to  force
             output of image always, even if optimized image was not smaller than input).

       --stdin
             Read  input  image  from  standard input. When this option is used then only one image is read from
             standard output. Any (other) input files specified on command line are  ignored.   Note,  if  input
             file '-' is seen on command line then standard input is also assumed.

             Currently  this  option  will  explicitly  enable  -f  option,  thus output image is always sent to
             standard output (even if no optimization was possible).

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) 1996-2015  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.