I am using 0.13 "Canary" and my web server has ImageMagick.
$config['image_manipulation_prog'] = 'IM';
$config['image_transform_lib_path'] = '/usr/X11R6/bin/';
Here's the error:
Warning: factory(IM.php): failed to open stream: No such file or directory in /home/thehoyts/public_html/lib/filemanager/ImageManager/Classes/Transform.php on line 130
Warning: factory(): Failed opening 'IM.php' for inclusion (include_path='') in /home/thehoyts/public_html/lib/filemanager/ImageManager/Classes/Transform.php on line 130
Fatal error: Cannot instantiate non-existent class: image_transform_driver_im in /home/thehoyts/public_html/lib/filemanager/ImageManager/Classes/Transform.php on line 133

