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exif

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.

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 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.

-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.

-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.

Help options

-?, --help

Show help message.

--usage

Display brief usage message.

EXAMPLES

Here are some examples of the use of exif:

exif -e picture.jpg

Extract thumbnail from picture.jpg to picture.jpg.modified.jpg

exif -t 0x9003 picture.jpg

Display EXIF tag 0x9003 (DateTimeOriginal)

exif --ifd=EXIF --tag 0x9003 --set-value='2007:09:17 09:30:55' picture.jpg

Set EXIF tag 0x9003 (DateTimeOriginal) to the given value, writing the new file to picture.jpg.modified.jpg

AUTHOR

Written by Lutz Mueller <lutz@users.sourceforge.net>.

SEE ALSO

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