public function getFilters()
    {
        if ($this->progressive) {
            $fc = new FilterChain();
            $fc->add(new Interlace(ImageInterface::INTERLACE_PLANE));
            return $fc;
        } else {
            return null;
        }
    }
public function getFilters()
    {
        if ($this->progressive) {
            $fc = new FilterChain();
            $fc->add(new Interlace(ImageInterface::INTERLACE_PLANE));
            return $fc;
        } else {
            return null;
        }
    }
public function getFilters ( ) { if ( $ this -> progressive ) { $ fc = new FilterChain ( ) ; $ fc -> add ( new Interlace ( ImageInterface :: INTERLACE_PLANE ) ) ; return $ fc ; } else { return null ; } }
Return a FilterChain with Filters for postprocessing the image

@return FilterChain|null
Return a FilterChain with Filters for postprocessing the image