I don't think this is by design?
There is a field named "Category:" above Description:" with each image. This field does not appear most of the time. It depends on how you view any image. Here are two examples of the same image. One where the field appears and one where it does not.
If you edit any image and continue browsing the gallery, or link to images with shortened URLs, the Category field
does appear if URL ends as shown.
Example Here Code:
Content visible to verified customers only.
Most visitors do not see this field as when just browsing the Gallery, the Category field
does not appear if URL ends as shown.
Example Here Code:
Content visible to verified customers only.