function water_mark($furl=""){
        $config['source_image'] = $furl;
        $config['wm_type'] = 'overlay';
        $config['wm_vrt_alignment']="bottom";
        $config['wm_hor_alignment']="right";
        $config['wm_overlay_path'] = 'publish/images/y_logo.png';
        $this->image_lib->initialize($config);
        $this->image_lib->watermark();  
        $this->image_lib->clear();
}
function thumb($furl,$width=125,$height=163,$new_img=""){
        $config['image_library'] = 'gd2';
        $config['source_image'] =$furl;
        $config['new_image'] = $furl.'.thumb.jpg';
        $config['width'] = $width;
        $config['height'] = $height;
        $this->image_lib->initialize($config);
        $this->image_lib->resize();
        $this->image_lib->clear();
}
/*先生成水印再生成缩略图  可以成功*/
//$this->water_mark($row);
//$this->thumb($row);
 
$this->thumb($row);
$this->water_mark($row);//不能看到水印啊,求解?