public function prosize(Int $width, Int $height = 0) : Thumb
    {
        $this->sets['prowidth']  = $width;
        $this->sets['proheight'] = $height;

        return $this;
    }
public function prosize(Int $width, Int $height = 0) : Thumb
    {
        $this->sets['prowidth']  = $width;
        $this->sets['proheight'] = $height;

        return $this;
    }
public function prosize ( Int $ width , Int $ height = 0 ) : Thumb { $ this -> sets [ 'prowidth' ] = $ width ; $ this -> sets [ 'proheight' ] = $ height ; return $ this ; }
Sets image proportional size

@param int $width
@param int $height

@return Thumb
Sets image proportional size