The Exiv2 library provides
- fast read and write access to the Exif, IPTC, and XMP metadata of an image
- an easy to use and extensively documented API
- a smart IPTC implementation that does not affect data that programs like Photoshop store in the same image segment
- adjust the Exif timestamp (that's how it all started...)
- rename Exif image files according to the Exif timestamp
- extract, insert and delete Exif, IPTC and XMP metadata and JPEG comments
- extract previews from RAW images and thumbnails from the Exif metadata
- insert and delete the thumbnail image embedded in the Exif metadata
- print, set and delete the JPEG comment of JPEG images
- fix the Exif ISO setting of picture taken with Canon and Nikon cameras
By default, the utility can print a summary of the Exif information by using the following command.
$ exiv2 image1.jpg
With the -pt option, the utility prints out all Exif information as interpreted (translated) values. Alternatively, -pv prints the plain Exif data values.
$ exiv2 -pt image1.jpg
A short description of the actions and options supported by the Exiv2 utility can be viewed by
$ exiv2 -h
Now to write a perl program to modify the metadata of an image you are interested in Ubuntu
Step - 1
*********
Include the EXIF/IPTC metadata manipulation library
$ sudo apt-get install eviv2 libexiv2-5 libexiv2-7 libexiv2-dev libexiv2-7-dev
Step - 2
********
Try the perl program given below:
#!/usr/bin/perl
use warnings;
use POSIX;
use Image::ExifTool qw(:Public);
my $jpg = $ARGV[0] or die "Usage: $0
my $tool = Image::ExifTool->new();
$tool->ExtractInfo($jpg);
$tool->SetNewValue('Make'); # Deleting this tag magically makes it work
$now_time = strftime "%Y:%m:%d %H:%M:%S", localtime;
$success = $tool->SetNewValue("DateTimeOriginal",$now_time);
if ($success) {
$success = $tool->WriteInfo($jpg);
print "DateTimeOriginal Update failed", $tool->GetValue('Error'), "\n" if ! $success;
}
$success = $tool->SetNewValue("DateTime",$now_time);
if ($success) {
$success = $tool->WriteInfo($jpg);
print "DateTime Update failed", $tool->GetValue('Error'), "\n" if ! $success;
}
$success = $tool->SetNewValue("DateTimeDigitized",$now_time);
if ($success) {
$success = $tool->WriteInfo($jpg);
print "DateTimeDigitized Update failed", $tool->GetValue('Error'), "\n" if ! $success;
}
> Save the program as test1.py
> Execute by
$ ./test.py myimage. jpeg
# Where myimage is the image which you want to update the metadata
(Date and time in this case)
