function sepia() {
		imagefilter($this->data,IMG_FILTER_GRAYSCALE);
		imagefilter($this->data,IMG_FILTER_COLORIZE,90,60,45);
		return $this->save();
	}
function sepia() {
		imagefilter($this->data,IMG_FILTER_GRAYSCALE);
		imagefilter($this->data,IMG_FILTER_COLORIZE,90,60,45);
		return $this->save();
	}
function sepia ( ) { imagefilter ( $ this -> data , IMG_FILTER_GRAYSCALE ) ; imagefilter ( $ this -> data , IMG_FILTER_COLORIZE , 90 , 60 , 45 ) ; return $ this -> save ( ) ; }
Apply sepia effect
@return object
Apply sepia effect