impossible to operate image_library

[eluser]Unknown[/eluser]
I do not understand why, can not see the image that results from this code, in the path. / images_local. although I successfully returns. It is as if the code does not do anything

Code:

$config['image_library'] = 'gd2';
                                        $config['source_image'] =                     './images_local/restaurantes.jpg';
                                        $config['new_image'] = './images_local/res.jpg';
                                        $config['create_thumb'] = TRUE;
                                        $config['maintain_ratio'] = TRUE;
                                        $config['width']  = 75;
                                        $config['height'] = 50;
                                        
                                        $this->load->library('image_lib', $config);
                                        $this->image_lib->initialize($config);
                                        $this->image_lib->resize();
                                        if ( ! $this->image_lib->resize())
                                         {
                                           echo $this->image_lib->display_errors();
                                         }
                                         else
                                         {
                                           echo('yes');  
                                         }