Laravel 5.4 Intevention Image Not Readable Exception when the image is readable

I'm learning about the Intervention Image package with Laravel 5.4. I've got an image stored in my public/images folder.

I installed Image according to the instructions on Intervention's page: added intervention to my composer.json file, ran composer update, updated my config/app file, and ran composer dump-autoload.

• When directly accessed as an image (the printf statement in the code block below) the image displays.

• Using the make method, I get a NotReadableException in AbstractDecoder.php.

Does anyone see if I'm doing something wrong in the code or may have missed a step in installation?

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Intervention\Image\Facades\Image;

class TestController extends Controller
{
    public function imagetest()
    {
        printf('<img src="/images/j6.jpg">'); //correctly displays image on page

        $img = Image::make("/images/j6.jpg")->resize(300, 200); //throws the error
        return $img->response('jpg');
    }
}

And here's the lead of the error block that's on the page after the "printf" image:

Whoops, looks like something went wrong.

1/1
NotReadableException in AbstractDecoder.php line 339:
Image source not readable
in AbstractDecoder.php line 339
at AbstractDecoder->init('/images/j6.jpg') in AbstractDriver.php line 64
at AbstractDriver->init('/images/j6.jpg') in ImageManager.php line 50
at ImageManager->make('/images/j6.jpg') in Facade.php line 221
at Facade::__callStatic('make', array('/images/j6.jpg')) in TestController.php line 14
at TestController->imagetest()
at call_user_func_array(array(object(TestController), 'imagetest'), array()) in Controller.php line 55
at Controller->callAction('imagetest', array()) in ControllerDispatcher.php line 44
at ControllerDispatcher->dispatch(object(Route), object(TestController), 'imagetest') in Route.php line 203
at Route->runController() in Route.php line 160
at Route->run() in Router.php line 559
at Router->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 30
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in SubstituteBindings.php line 41
at SubstituteBindings->handle(object(Request), object(Closure)) in Pipeline.php line 148

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<script type="text/javascript" src=""></script>
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