Laravel Progressive Image using Image intervention

I want to know how to apply progressive image in my website. I'm using Image intervention. I search some way to apply image intervention but I did not understand. Like

$img = Image::make('public/foo.png');
$img->interlace();

the original image and image that interlace don't have difference. Can anyone help me to understand progressive image and how to apply it using image itervention in my website?

via Chebli Mohamed