In Yii 2 there are many function including built-in helper for building urls. So we can easily bulld the url to image by path too .

To display the image in grid view :

	 [
               'attribute' => 'image',
               'format' => 'html',    
               'value' => function($data) {
                  return Html::img(\Yii::$app->request->BaseUrl.'/uploads/'.$data->image,['width'=>100]);
               },
            ]

To display the image in DetailView :

[
 'attribute'=>'image',
 'value'=>(\Yii::$app->request->BaseUrl.'/uploads/tips/'.$model->image),
 //'value'=>$model->image,
 'format' => ['image',['width'=>'100','height'=>'100']],
 ],