I've not installed it, but it looks like Apache-ImageMagick is available with PPM.

UPDATE:

This actually looks like a set of hooks to the ImageMagick library, but it do seem to indicate that ImageMagick should work...

All you need to do is install ImageMagick on your machine. During the install, it asks if it should install perlmagick for activestate perl. This is a standard module for using ImageMagick (docs here):
http://search.cpan.org/~jcristy/PerlMagick-6.20/Magick.pm

UPDATE 2:

This should get you going with ImageMagick, if you decide to use it:

use Image::Magick;
my($image, $x);
$image = Image::Magick->new;
$x = $image->Read('test.jpg');
    warn "$x" if "$x";

$x = $image->Write('test.bmp');
    warn "$x" if "$x";
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Hope this helps...