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.
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:
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.
Force optimization, even if the result would be larger than the
Displays short usage information and exits.
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
Don’t really optimize files, just print results.
Overwrite target file even if it exists (when using -d option).
Preserve file modification times.
Print totals after processing all files.
Enables verbose mode (positively chatty).
Strip all (Comment & Exif) markers from output file. (NOTE! by
default only Comment & Exif markers are kept, everything else is
Strip Comment (COM) markers from output file.
Strip EXIF markers from output file.
Strip IPTC markers from output file.
Strip ICC profiles from output file.
When optimizing progressive jpeg, result will be a normal jpeg.
Timo Kokkonen <firstname.lastname@example.org>
Copyright (C) 1996,2002,2009 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., 675 Mass Ave, Cambridge, MA 02139, USA.