If you want to determine the size of an image file on a Linux system, for some types of image files, e.g., PNG or GIF files, you can just use the file command. E.g.:
$ file ~/Documents/System_Memory.png /home/jdoe/Documents/System_Memory.png: PNG image data, 800 x 600, 8-bit/color RGBA, non-interlaced $ file ~/Documents/recipes/asparagus-strawberry-salad.gif /home/jdoe/Documents/recipes/asparagus-strawberry-salad.gif: GIF image data, version 89a, 250 x 153 $
But if you obtain information on a JPG/JPEG file with that command, it doesn't provide any information on the dimensions of the image.
$ file ~/Documents/Winter.jpg /home/jdoe/Documents/Winter.jpg: JPEG image data, JFIF standard 1.02 $
If you install the exiv2 package, you can also display the dimensions of JPEG images as well as PNG, GIF, and other image formats.
$ exiv2 /home/jdoe/Documents/Winter.jpg File name : /home/jdoe/Documents/Winter.jpg File size : 105542 Bytes MIME type : image/jpeg Image size : 800 x 600 /home/jdoe/Documents/Winter.jpg: No Exif data found in the file $ exiv2 /home/jdoe/Documents/System_Memory.png File name : /home/jdoe/Documents/System_Memory.png File size : 135335 Bytes MIME type : image/png Image size : 800 x 600 /home/jdoe/Documents/System_Memory.png: No Exif data found in the file $ exiv2 /home/jdoe/Documents/recipes/asparagus-strawberry-salad.gif File name : /home/jdoe/Documents/recipes/asparagus-strawberry-salad.gif File size : 31346 Bytes MIME type : image/gif Image size : 250 x 153 /home/jdoe/Documents/recipes/asparagus-strawberry-salad.gif: No Exif data found in the file $
Note: the reference to "No Exif data found in the file" indicates that the iamge file doesn't contain exchangeable image file format (Exiv) data, which a digital camera may store in an image file, such as a JPEG file. E.g., the camera might store geolocation data indicating the geographical locate where the picture was taken.
To install the exiv2
package on
Red Hat
Linux or
CentOS systems, you can issue the command yum install exiv2.
# yum install exiv2 Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: mirrors.lga7.us.voxel.net * epel: mirror.cogentco.com * extras: mirror.cs.pitt.edu * updates: mirror.genesisadaptive.com Resolving Dependencies --> Running transaction check ---> Package exiv2.x86_64 0:0.23-6.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: exiv2 x86_64 0.23-6.el7 base 82 k Transaction Summary ================================================================================ Install 1 Package Total download size: 82 k Installed size: 196 k Is this ok [y/d/N]: y Downloading packages: exiv2-0.23-6.el7.x86_64.rpm | 82 kB 00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : exiv2-0.23-6.el7.x86_64 1/1 Verifying : exiv2-0.23-6.el7.x86_64 1/1 Installed: exiv2.x86_64 0:0.23-6.el7 Complete! #
Once it is installed, you can view information for the package with
the rpm command using rpm -qi exiv2 and see the files included
in the package with rpm -ql exiv2.
$ rpm -qi exiv2 Name : exiv2 Version : 0.23 Release : 6.el7 Architecture: x86_64 Install Date: Sun 09 Jul 2017 11:31:45 AM EDT Group : Applications/Multimedia Size : 201126 License : GPLv2+ Signature : RSA/SHA256, Thu 03 Jul 2014 09:15:40 PM EDT, Key ID 24c6a8a7f4a80eb5 Source RPM : exiv2-0.23-6.el7.src.rpm Build Date : Mon 09 Jun 2014 07:49:58 PM EDT Build Host : worker1.bsys.centos.org Relocations : (not relocatable) Packager : CentOS BuildSystem <http://bugs.centos.org> Vendor : CentOS URL : http://www.exiv2.org/ Summary : Exif and Iptc metadata manipulation library Description : A command line utility to access image metadata, allowing one to: * print the Exif metadata of Jpeg images as summary info, interpreted values, or the plain data for each tag * print the Iptc metadata of Jpeg images * print the Jpeg comment of Jpeg images * set, add and delete Exif and Iptc metadata of Jpeg images * adjust the Exif timestamp (that's how it all started...) * rename Exif image files according to the Exif timestamp * extract, insert and delete Exif metadata (including thumbnails), Iptc metadata and Jpeg comments $ rpm -ql exiv2 /usr/bin/exiv2 /usr/share/doc/exiv2-0.23 /usr/share/doc/exiv2-0.23/COPYING /usr/share/doc/exiv2-0.23/README /usr/share/man/man1/exiv2.1.gz $
You can see usage information for the program with exiv2 -h.
$ exiv2 -h
Usage: exiv2 [ options ] [ action ] file ...
Manipulate the Exif metadata of images.
Actions:
ad | adjust Adjust Exif timestamps by the given time. This action
requires at least one of the -a, -Y, -O or -D options.
pr | print Print image metadata.
rm | delete Delete image metadata from the files.
in | insert Insert metadata from corresponding *.exv files.
Use option -S to change the suffix of the input files.
ex | extract Extract metadata to *.exv, *.xmp and thumbnail image files.
mv | rename Rename files and/or set file timestamps according to the
Exif create timestamp. The filename format can be set with
-r format, timestamp options are controlled with -t and -T.
mo | modify Apply commands to modify (add, set, delete) the Exif and
IPTC metadata of image files or set the JPEG comment.
Requires option -c, -m or -M.
fi | fixiso Copy ISO setting from the Nikon Makernote to the regular
Exif tag.
fc | fixcom Convert the UNICODE Exif user comment to UCS-2. Its current
character encoding can be specified with the -n option.
Options:
-h Display this help and exit.
-V Show the program version and exit.
-v Be verbose during the program run.
-q Silence warnings and error messages during the program run (quiet).
-Q lvl Set log-level to d(ebug), i(nfo), w(arning), e(rror) or m(ute).
-b Show large binary values.
-u Show unknown tags.
-g key Only output info for this key (grep).
-n enc Charset to use to decode UNICODE Exif user comments.
-k Preserve file timestamps (keep).
-t Also set the file timestamp in 'rename' action (overrides -k).
-T Only set the file timestamp in 'rename' action, do not rename
the file (overrides -k).
-f Do not prompt before overwriting existing files (force).
-F Do not prompt before renaming files (Force).
-a time Time adjustment in the format [-]HH[:MM[:SS]]. This option
is only used with the 'adjust' action.
-Y yrs Year adjustment with the 'adjust' action.
-O mon Month adjustment with the 'adjust' action.
-D day Day adjustment with the 'adjust' action.
-p mode Print mode for the 'print' action. Possible modes are:
s : print a summary of the Exif metadata (the default)
a : print Exif, IPTC and XMP metadata (shortcut for -Pkyct)
t : interpreted (translated) Exif data (-PEkyct)
v : plain Exif data values (-PExgnycv)
h : hexdump of the Exif data (-PExgnycsh)
i : IPTC data values (-PIkyct)
x : XMP properties (-PXkyct)
c : JPEG comment
p : list available previews
-P flgs Print flags for fine control of tag lists ('print' action):
E : include Exif tags in the list
I : IPTC datasets
X : XMP properties
x : print a column with the tag number
g : group name
k : key
l : tag label
n : tag name
y : type
c : number of components (count)
s : size in bytes
v : plain data value
t : interpreted (translated) data
h : hexdump of the data
-d tgt Delete target(s) for the 'delete' action. Possible targets are:
a : all supported metadata (the default)
e : Exif section
t : Exif thumbnail only
i : IPTC data
x : XMP packet
c : JPEG comment
-i tgt Insert target(s) for the 'insert' action. Possible targets are
the same as those for the -d option, plus a modifier:
X : Insert metadata from an XMP sidecar file <file>.xmp
Only JPEG thumbnails can be inserted, they need to be named
<file>-thumb.jpg
-e tgt Extract target(s) for the 'extract' action. Possible targets
are the same as those for the -d option, plus a target to extract
preview images and a modifier to generate an XMP sidecar file:
p[<n>[,<m> ...]] : Extract preview images.
X : Extract metadata to an XMP sidecar file <file>.xmp
-r fmt Filename format for the 'rename' action. The format string
follows strftime(3). The following keywords are supported:
:basename: - original filename without extension
:dirname: - name of the directory holding the original file
:parentname: - name of parent directory
Default filename format is %Y%m%d_%H%M%S.
-c txt JPEG comment string to set in the image.
-m file Command file for the modify action. The format for commands is
set|add|del <key> [[<type>] <value>].
-M cmd Command line for the modify action. The format for the
commands is the same as that of the lines of a command file.
-l dir Location (directory) for files to be inserted from or extracted to.
-S .suf Use suffix .suf for source files for insert command.
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