http://vitochin.blogspot.com/2009/05/gmagick-extension.html

not sure if adding support/integrating gmagick at this point is something you guys want to consider, however it does seem to have a lot of benefits over imagick. Cheers.

Mostly, adding support for this (or Imagick) is a matter of finding someone with working knowledge of the tool and time to spend on the implementation. If you fit that category, get the current development stream. All the image handling has been abstracted into a library. So what is needed is to create the equivalent to the lib-GD script for gmagick and place the appropriate decision code in functions-basic.php. (There is code there now to detect Imagick, but since we don't have the Imagick library, it loads lib-GD.php.

Sounds like a plan, I'll try to work on it as time allows.

Thanks. You might want to create a ticket for this feature. Assign it to yourself and accept it so that people can know there is (might be) some activity with regards to it.