Laravel Intervention Image Class - Class 'Image' not found

i'm trying to install 'intervention/image` from composer, but after install that i get this error:

Class 'Image' not found

1: install via composer:

composer require intervention/image 

2: add to providers array:

'Intervention\Image\ImageServiceProvider' 

3: add to aliases array:

'Image' => 'Intervention\Image\Facades\Image'

4: upadte composer

composer update

5: publish:

php artisan vendor:publish --provider="Intervention\Image\ImageServiceProviderLaravel5" 

public result:

Nothing to publish for tag [].

6: autoload

composer dump-autoload

via Chebli Mohamed