Image dtype error?

feature_description = {
‘image’:, dtype=tf.string),
‘label’:, dtype=tf.int64),

In the tfrecords notebook from week 2, we have the dictionary declaration above. My question is the following:
Why is the image dtype a string in the feature_description dictionary above when it clearly shows the image dtype as uint8 in the features.json file?

Its probably a string description of the image and the label an int number representing the class.