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 '.' => map { ($\_\[0\] >> 8\*(3-$\_)) % 256 } 0 .

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.