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protected function image_create($size_x = null, $size_y = null){	if ($size_x === null && $size_y === null)	{		$format = exif_imagetype($this->filename);		if ($format)		{			switch($format)			{				case 1: $source = imagecreatefromgif($this->filename); break;				case 2: $source = imagecreatefromjpeg($this->filename); break;				case 3: $source = imagecreatefrompng($this->filename); break;			}			return $source;		}		else		{			return false;		}	}	elseif ($size_x !== null && $size_y !== null)	{		$source = imagecreatetruecolor($size_x, $size_y);		return $source;	}	else	{		return false;	}}