$sourceGdImage is always FALSE.

imagecreatefrom 1

...
		$sourceGdImage = FALSE;
		
		switch ($this->getOriginalResource()->getFileExtension()) {
			case 'gif':
				$sourceGdImage = imagecreatefromgif($fileTemp);
				
			break;
			
			case 'jpeg':
			case 'jpg':
				$sourceGdImage = imagecreatefromjpeg($fileTemp);
				
			break;
			
			case 'png':
			default:
				$sourceGdImage = imagecreatefrompng($fileTemp);
				
			break;
		}
		
		 // Code in this if is NEVER executed
		if ($sourceGdImage !== FALSE) {
		    ...
		}
		
		...