public function blackwhite()
    {
        imagefilter($this->image, \IMG_FILTER_GRAYSCALE);
        imagefilter($this->image, \IMG_FILTER_CONTRAST, -1000);

        return $this;
    }
public function blackwhite()
    {
        imagefilter($this->image, \IMG_FILTER_GRAYSCALE);
        imagefilter($this->image, \IMG_FILTER_CONTRAST, -1000);

        return $this;
    }
public function blackwhite ( ) { imagefilter ( $ this -> image , \ IMG_FILTER_GRAYSCALE ) ; imagefilter ( $ this -> image , \ IMG_FILTER_CONTRAST , - 1000 ) ; return $ this ; }
Makes black and white

@return \Krystal\Image\Processor\GD\ImageProcessor
Makes black and white