You should use the built in Image::Size. In fact, the rewrites of the programs use GT::Image::Size not the CPAN distribution. I'm not sure what the differences are, but the Thumbnailer is only using Image::Size for the size values. I imagine the fixes might be for performance, new image types, or code changes to make it compatible with new Perl features. The actual functionality is pretty simple. :)
Quote:
Changes in 3.01:
* Added ex/ directory with a few samples.
* Dropped ExtUtils::MakeMaker and switched to Module::Build. Makefile.PL is
now a wrapper of sorts around Build.PL. This allows adding licensing
information to META.yml for CPAN indexing.
Changes in 3.0:
* Added test suites for POD correctness and POD coverage.
* Implemented and documented a flag called $Image::Size::GIF_BEHAVIOR that
controls whether the GIF code returns the screensize, the first sub-image
or the largest of the sub-images.
* Applied a patch from mrj@mrj.spb.ru to fix usage of the Compress::Zlib
module in the handling of compressed flash files. Added a new SWF file to
test this, and added reference to the file in MANIFEST and t/all.t.
* Delay Image::Magick loading until it is needed. (Mark Stosberg).
Add support for Graphics::Magick as an alternative to Image::Magick.
If either Graphics::Magick or Image::Magick is loaded into memory
that module will be used. Otherwise, they are both tried to be loaded,
with Graphics::Magick being tried first. (Mark Stosberg). This patch also
adds a new test suite, t/magick.t, to the distribution and modifies both
MANIFEST and Makefile.PL (to add a build-dependancy on Test::More).
* With Test::More now required for building, converted t/all.t to use it.
Changes in 2.992:
* Added support for FlashMX (Shockwave Flash ver. 6), as contributed by
Victor L Kuriashkin <victor@yasp.com>.
Changes in 2.991:
* Small fix to setup of scalar refs in Size.pm, in case the ref points to
an undef value.
* Code clean-up on the imgsize script.
Changes in 2.99:
* Applied two patches from Ville Skyttä <ville.skytta@iki.fi>, one providing
support for MNG, the other for supporting anything Image::Magick does.
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