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jpegoptim

Langue: en

Version: 333119 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

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[0..100], --max=[0..100]
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.
-n, --noaction
Don't really optimize files, just print results.
-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).
--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 optimizing progressive jpeg, result will be a normal jpeg.

SEE ALSO

jpeginfo(1)

AUTHOR

Timo Kokkonen <tjko@iki.fi>

COPYING

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.

Je pense que je vais créer un autre format que le MPG, AVI et MOV, qui
soit propre à MultideskOS, avec mes propres compressions. J'ai quelques
idées pour faire de bonnes compressions.
-- Jayce - Garagiste --