Laravel completely ignoring my config file

So, I'm trying to use Intervention Image with the Imagick driver.

I've done php artisan vendor:publish, and selected Intervention, and now config/image.php exists. I've changed 'driver' => 'gd' to 'driver' => 'imagick', but nothing at all happens.

I then tried php artisan config:cache, same thing. Then composer dump-autoload, then php artisan cache:clear and any other combinations of the above.

I can put literally anything in this file, fill the array with invalid syntax, junk etc, and it's completely ignored.

Is there something I'm missing? I've tried everything I'm aware of.

via Chebli Mohamed