code: public function resizeTo($width, $height, $mode='')
  	{
  		if (!$this->isImage)
  		{
  			return false;
  		}
  
  		$return = System::getContainer()
  			->get('contao.image.image_factory')
  			->create($this->strRootDir . '/' . $this->strFile, array($width, $height, $mode), $this->strRootDir . '/' . $this->strFile)
  			->getUrl($this->strRootDir)
  		;
  
  		if ($return)
  		{
  			$this->arrPathinfo = array();
  			$this->arrImageSize = array();
  		}
  
  		return $return;
  	}
docs: Resize the file if it is an image
  
  @param integer $width  The target width
  @param integer $height The target height
  @param string  $mode   The resize mode
  
  @return boolean True if the image could be resized successfully