exif(1)

NAME
exif - shows EXIF information in JPEG files

SYNOPSIS
exif [ OPTION ] [ file... ]

DESCRIPTION
exif is a small command-line utility to show and change EXIF information in JPEG files.

Most digital cameras produce EXIF files, which are JPEG files with extra tags that contain information about the image. The exif command-line utility allows you to read EXIF information from and write EXIF information to those files. exif internally uses the libexif library.

Each input file given on the command line is acted upon in turn, using all the options given. Execution will be aborted immediately if one file is not readable or does not contain EXIF tags.

As EXIF tags are read, any unknown ones are discarded and known ones are automatically converted into the correct format, if they aren't already. Corrupted MakerNote tags are also removed, but no format changes are made.

OPTIONS

-v, --version
    Display the exif version number.

-i, --ids
    Show ID numbers instead of tag names.

-t, --tag=TAG
    Select only this TAG. TAG is the tag title, the short tag name, or the tag number (hexadecimal numbers are prefixed with 0x), from the IFD specified with --ifd. The tag title is dependent on the current locale, whereas name and number are locale-independent.

--ifd=IFD
    Select a tag or tags from this IFD. Valid IFDs are "0", "1", "EXIF", "GPS", and "Interoperability". Defaults to "0".

-l, --list-tags
    List all known EXIF tags and IFDs. A JPEG image must be provided, and those tags which appear in the file are shown with an asterisk in the corresponding position in the list.

-|, --show-mnote
    Show the contents of the MakerNote tag. The contents of this tag are nonstandard (and often undocumented) and may therefore not be recognized, or if they are recognized they may not necessarily be interpreted correctly.

--remove
    Remove the tag or (if no tag is specified) the entire IFD.

-s, --show-description
    Show description of tag. The --tag option must also be given.

-e, --extract-thumbnail
    Extract the thumbnail, writing the thumbnail image to the file specified with --output.

-r, --remove-thumbnail
    Remove the thumbnail from the image, writing the new image to the file specified with --output.

-n, --insert-thumbnail=FILE
    Insert FILE as thumbnail. No attempt is made to ensure that the contents of FILE are in a valid thumbnail format.

--no-fixup
    Do not attempt to fix EXIF specification violations when reading tags. exif will remove illegal or unknown tags, add some mandatory tags using default values, and change the data type of tags to match that required by the specification.

-o, --output=FILE
    Write output image to FILE. If this option is not given and an image file must be written, the name used is the same as the input file with the suffix ".modified.jpeg".

--set-value=VALUE
    Set the data for the tag specified with --tag and --ifd to VALUE. Compound values consisting of multiple components are separated with spaces.

-c, --create-exif
    Create EXIF data if it does not exist

-m, --machine-readable
    Produce output in a machine-readable (tab-delimited) format. The --xml-output and --machine-readable options are mutually exclusive.

-w, --width=N
    Set the maximum width of the output to N characters (default 80). This does not apply to some output formats (e.g. XML).

-x, --xml-output
    Produce output in an XML format (when possible). The --xml-output and --machine-readable options are mutually exclusive.

-d, --debug
    Show debugging messages. Also, when processing a file that contains corrupted data, this option causes exif to attempt to continue processing. Normally, corrupted data causes an abort.

  Help options

-?, --help
    Show help message.

--usage
    Display brief usage message.

EXAMPLES
Display all recognized EXIF tags in an image and the tag contents, with bad tags fixed:

    exif image.jpg

Display a table listing all known EXIF tags and whether each one exists in the given image:

    exif --list-tags --no-fixup image.jpg

Extract the thumbnail into the file thumbnail.jpg:

    exif --extract-thumbnail --output=thumbnail.jpg image.jpg

Display a list of the numeric values of only the EXIF tags in the thumbnail IFD (IFD 1) and the tag values:

    exif --ids --ifd=1 --no-fixup image.jpg

Display the meaning of tag 0x9209 in the "EXIF" IFD according to the EXIF specification:

    exif --show-description --ifd=EXIF --tag=0x9209

Add an Orientation tag with value "bottom - left" to an existing image:

    exif --output=new.jpg --ifd=0 --tag=0x0112 --set-value=4 --no-fixup image.jpg

Add a YCbCr Sub-Sampling tag with value 2,1 (a.k.a YCbCr 4:2:2) to an existing image and fix the existing tags, if necessary:

    exif --output=new.jpg --tag=YCbCrSubSampling --ifd=0 --set-value='2 1' image.jpg

AUTHOR
exif was written by Lutz Mueller <lutz@users.sourceforge.net> and numerous contributors. This man page is Copyright © 2002-2009 Thomas Pircher and others.

SEE ALSO
http://www.sourceforge.net/projects/libexif