NAME

jpeginfo - prints information and tests integrity of JPEG/JFIF files.

SYNOPSIS

jpeginfo [ options ] [ filenames ]

DESCRIPTION

jpeginfo is used to generate informative listings of jpeg files, and also to check jpeg files for errors. Program also supports automatic deletion of broken jpegs.

OUTPUT FORMATS

jpeginfo supports several different output formats. Default formats are meant to be displayed on screen, while there is also CSV and JSON formats that are easier to parse by another program.

While CSV and JSON formats always display all "columns", other formats don't display columns that do not have any data. For example if -c option is not used to check JPEG integrity, then the `status` (and `details`) columns won't be displayed.

Similarly if MD5/SHA-2 checksum (hash) is not calculated, then that column will not be shown.

Default Format

Default output format:

Example:

$ jpeginfo *.jpeg

IMG_1439.jpeg 3282 x 3024 24bit N JFIF,Exif 2961607

IMG_1560.jpeg 3815 x 2862 24bit N JFIF 1045063

IMG_2520.jpeg 3964 x 2900 24bit N JFIF,Exif,ICC 4712099

Extra information format

Additional information can be displayed using -i option:

Example:

$ jpeginfo -i *.jpeg

IMG_1439.jpeg 3282 x 3024 24bit N JFIF,Exif Huffman,300dpi 2961607

IMG_1560.jpeg 3815 x 2862 24bit N JFIF Huffman,300dpi 1045063

IMG_2520.jpeg 3964 x 2900 24bit N JFIF,Exif,ICC Huffman,300dpi 4712099

Ls command style output format

Option -l moves filename to be last column, resulting output that is bit like output from `ls -l` command:

<image_width> x <image_height> <colordepth> <progressive_vs_normal> <markers> <size> <filename>

Example:

$ jpeginfo -l *.jpeg

3282 x 3024 24bit N JFIF,Exif 2961607 IMG_1439.jpeg

3815 x 2862 24bit N JFIF 1045063 IMG_1560.jpeg

3964 x 2900 24bit N JFIF,Exif,ICC 4712099 IMG_2520.jpeg

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 jpeginfo are the following:

-c, --check: Check files also for errors. (default is just to read the headers).
-C, --comments: Display file comments (from COM markers).
-d, --delete: Delete files that have errors. (default is not to delete any files).
-f<filename>, --file<filename>: Read filenames to process from given file. To use standard input (stdin) use '-' as a filename. This is alternative to default where filenames are given as parameters to the program.
-h, --help: Display short usage information and exits.
-H, --header: Display column names header in output.
-2, --sha256: Calculates SHA-256 checksum for each file.
--sha512: Calculates SHA-512 checksum for each file.
-5, --md5: Calculates MD5 checksum for each file.
-i, --info: Displays even more information about each picture. Prints image coding (Huffman/Arithmetic), density (in dpi/dpc), and whether CCIR601 sampling was used or not.
-j, --json: JavaScript Object Notation (JSON) output format.
-l, --lsstyle: Uses alternate listing format (ls -l style).
-v, --verbose: Enables verbose mode (positively chatty).
--version: Displays program version.
-q, --quiet: Quiet mode, output just the jpeg infos.
-s, --csv: Comma separated values (CSV) output format.
-m<mode>, --mode=<mode>: Sets the delete mode, meaningful only when used with -d flag. Mode can be one of the following:

all: Files containing any type of errors/warnings, not necessary preventing the decoding. (default)
erronly: Only files with serious errors (i.e. cannot be decoded at all).

-, --stdin

Read input from standard input (instead of a file).

Known JPEG Markers

jpegoptim scans through application (APP) markers in the JPEG image and will display information about "well known" markers found in the image. Markers found in image are listed in the "markers" column.

Known Application Markers

Currently jpegoptim recognizes following common application markers found in JPEG images:

Marker Name	Description
JFIF	JPEG File Interchange Format
JFXX	JFIF Extension
Exif	Exchangeable Image File Format
XMP	Extensible Metadata Platform (Adobe)
ICC	ICC Color Profile
IPTC	IPTC (Adobe Photoshop)
Adobe	Adobe
AdobeCM	Adobe Color Management
CIFF	Canon Raw
AVI1	AVI Video
QVCI	Casio QVCI
FLIR	FLIR
FPXR	Kodak FlashPix
MPF	CIPA Multi-Picture Format
Meta	Kodak Meta
Stim	CIPA Stereo Still Image
JPS	JPEG Stereo Image
Scalado	Scalado
RMETA	Ricoh Meta
EPPIM	Toshiba PrintIM
NITF	National Imagery Transmission Format
GoPro	GoPro
SPIFF	JPEG Still Picture Interchange File Format
AROT	Apple
HDR	JPEG-HDR

Other Markers

If image contained any unrecognized application (APP) markers then "UNKNOWN" is added to the list of found markers.

Additionally if image contained any comment (COM) markers then "COM" is added to the list of found markers.

EXIT STATUS

Program returns 0 on successful run. Non-zero exit status is returned if there were any errors.

When using --check (or -c) option return value is non-zero if one or more of the files checked had any errors.

AUTHOR

Timo Kokkonen (tjko@iki.fi)

COPYING

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 3 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, see <https://www.gnu.org/licenses/>.