Provided by: jpegoptim_1.4.6-1_amd64 bug


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


       jpegoptim [ options ] [ filenames ]


       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

       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 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).

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

             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.

             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 Comment (COM) markers from output file.

             Strip EXIF markers from output file.

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

             Strip ICC profiles from output file.

             Strip XMP profiles from output file.

             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).

             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).


       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.




       Timo Kokkonen <>


       Copyright (C) 1996-2018  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.