ImageMagick / Mountain Lion

Hi,
I'm having a lot of trouble installing ImageMagick on a Mac running 10.8.2. I tried MacPorts, I tried Brew, I tried their own installation, and I tried @fgertz' method (in another forum topic). Omeka is working fine, but not ImageMagick. I've done the error reporting stuff, but all I get, when I go to omeka/admin/settings, and enter /usr/local/bin/ is "fails". Even though terminal tells me /usr/local/bin/convert when I ask it "which convert"...
Any advice gratefully received.
Nicky

So now I have a brewed imagemagick, which is working fine, I just can't get Omeka to recognize it. /usr/local/bin fails, and if I try to upload an image anyway, I get the following message :

Omeka has encountered an error

Omeka_File_Derivative_Exception
Something went wrong with image creation. Please notify an administrator.

#0 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/File/Derivative/Image.php(113): Omeka_File_Derivative_Image::createImage('/var/folders/zg...', '800', 'fullsize')
#1 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/File/Derivative/Image.php(222): Omeka_File_Derivative_Image::createDerivativeImages('/var/folders/zg...')
#2 /Users/excentrique/Documents/Omeka/Omeka/application/models/File.php(248): Omeka_File_Derivative_Image::createAll('/var/folders/zg...', 'image/jpeg')
#3 /Users/excentrique/Documents/Omeka/Omeka/application/models/File/ProcessUploadJob.php(24): File->createDerivatives()
#4 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Job/Dispatcher/Adapter/Synchronous.php(25): File_ProcessUploadJob->perform()
#5 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Job/Dispatcher/Default.php(95): Omeka_Job_Dispatcher_Adapter_Synchronous->send('{"className":"F...', Array)
#6 /Users/excentrique/Documents/Omeka/Omeka/application/models/File.php(70): Omeka_Job_Dispatcher_Default->send('File_ProcessUpl...', Array)
#7 [internal function]: File->afterInsert()
#8 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Record.php(282): call_user_func_array(Array, Array)
#9 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Record.php(561): Omeka_Record->runCallbacks('afterInsert')
#10 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Record.php(581): Omeka_Record->save()
#11 /Users/excentrique/Documents/Omeka/Omeka/application/models/Item.php(303): Omeka_Record->forceSave()
#12 /Users/excentrique/Documents/Omeka/Omeka/application/models/Item.php(239): Item->saveFiles()
#13 [internal function]: Item->afterSave()
#14 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Record.php(282): call_user_func_array(Array, Array)
#15 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Record.php(566): Omeka_Record->runCallbacks('afterSave')
#16 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Record.php(807): Omeka_Record->save()
#17 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Controller/Action.php(419): Omeka_Record->saveForm(Array)
#18 /Users/excentrique/Documents/Omeka/Omeka/application/controllers/ItemsController.php(133): Omeka_Controller_Action->addAction()
#19 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Zend/Controller/Action.php(516): ItemsController->addAction()
#20 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(295): Zend_Controller_Action->dispatch('addAction')
#21 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#22 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#23 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#24 /Users/excentrique/Documents/Omeka/Omeka/application/libraries/Omeka/Core.php(165): Zend_Application->run()
#25 /Users/excentrique/Documents/Omeka/omeka/admin/index.php(44): Omeka_Core->run()
#26 {main}