Image intervention

I'm new in Laravel. I tried to use image intervention with laravel function StoreAs but it show this error Command (StoreAs) is not available for driver (Gd). Here is my code:

public function postForm( Request $q ){

    if($q->hasFile('image')) {

    $image       = $q->file('image');
    $filename    = $image->getClientOriginalName();

    $image_resize = Image::make($image->getRealPath());              
    $image_resize->resize(300, 250);   
        $image_resize->storeAs('image', $filename    , 'uploads');




}   

}