Config para geração de thumbnails

$thumb_path = $album_path.DS."thumbs";
mkdir ($thumb_path,0777);
$config['source_image'] = array();
$config['new_image'] = array();
foreach ($files as $image) {
    $config['image_library'] = 'gd';
    $config['create_thumb'] = TRUE;
    $config['width'] = 200;
    $config['height'] = 200;
    $config['source_image'] = $album_path.DS.$image;
    $config['new_image'] = $thumb_path.DS;
    $this->load->library('image_lib', $config);
    $this->image_lib->resize();
    if ( ! $this->image_lib->resize()){
        echo $this->image_lib->display_errors();
    }
    $this->image_lib->clear();
}