Image dtype error?

Course Q&A TensorFlow: Data and Deployment Specialization Data Pipelines with TensorFlow Data Services
1

feature_description = {
‘image’: tf.io.FixedLenFeature(, dtype=tf.string),
‘label’: tf.io.FixedLenFeature(, 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?

2

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