- Zoom pictures to improve efficiency
- Picture grayscale
- Calculate edges based on brightness
The third step is the most critical. There are many ways to directly contrast the adjacent brightness.
composer require lizhichao/one-img
$img_path = '1.jpg'; $img = new \OneImg\Border(); $img->setImg($img_path) ->scale(300, 300) ->outline() ->save(); //Output to browser