/**
* Returns true if sfFilebasePluginFile is an
* image file. Used to factory
* a sfFilebasePluginImage instance by sfFilebasePlugin::
* getFilebaseFile()
*
* @see sfFilebaseUtil::getIsImage()
* @todo improved mime-type detection
* @return boolean true if file is an image
*/
public function isImage()
{
return $this->filebase->getIsImage($this);
}