Perl

Fetching Image details in Perl

Image::Size is fine, if size is the only thing, which matters. Sometimes, however, it isn’t enough, and when that is the case Image::Info (again fetched from CPAN) is your friend. Point it to a file (through various methods), and it will return a hash with all the information available about the image you pointed at. Most popular formats are supported. #!/usr/bin/perl -w use strict; use Image::Info; # Just fetch the size my $imgInfo = Image::Info::image\_info("test.

Rotating an Image with Perl

Turning images is quite simple. In the example below an image is turned 90 degrees clockwise, wirtten to a file, turned another 90 degress and written to a file again. #!/usr/bin/perl -w use strict; use Image::Magick; my $image = Image::Magick->new(magick=>'JPEG'); my $x = $image->Read('test.jpg'); $x = $image->Rotate(degrees=>90); # 90 degress clockwise $x = $image->Write('test.90.jpg'); $x = $image->Rotate(degrees=>90); # Another 90 degress clockwise $x = $image->Write('test.180.jpg'); exit();

IP address conversion with Perl

With Perl you can do many interesting transformations of IP-numbers. Below is two small examples allowing conversions from “IP quad” (xxx.xxx.xxx.xxx) format to a single decimal and back. The decimal format may be more convenient and efficient to store in a database. sub ip2dec ($) { return unpack N => pack CCCC => split /\\./ => shift; } sub dec2ip ($) { return join '.

Bulk resizing images with Perl

Suppose you’ve just filled you digital camera with an endless stream of photos. You want to place them online at your website, but placing 5+ megapixel files online, well…probably a bad idea. Let’s resize them to a propper size - and why not use Perl and ImageMagick for the job.┬áNot a problem, here’s a complete example on how to resize all images in a directory . Make sure you have ImageMagick installed.

Converting between image formats with Perl

Changing files from one format to another is quite easy with a little bit of ImageMagick . In the example below a JPG image (test.jpg) is converted into a GIF-image (test.gif). To output in a different (ImageMagick supported ) format, just change the “image->Set” line. #!/usr/bin/perl -w use strict; use Image::Magick; my $image = Image::Magick->new(); # To explicitly set image format use this instead: # my $image = Image::Magick->new(magick=> 'JPEG'); my $x = $image->Read('test.