/**
* Returns true if Imagick is installed and says that the iamge is transparent.
*
* @return bool
*/
public function isTransparent()
{
if (craft()->images->isImagick() && method_exists("Imagick", "getImageAlphaChannel")) {
return $this->_image->getImagineImageInterface()->getImagick()->getImageAlphaChannel();
}
return false;
}