Custom image size without streaching with image intervation?

I want to make thumb from orginal image with size 263x385 but problem is that image is always streach. Any suggestion how can i do this?

Im using this code:

  $image->resize(263, 385, function ($c) {
          $c->upsize();
        })->save($article_image_path . '/article_' . $article->id . '/thumbs/263x385/' . $filename);

via Chebli Mohamed