If we go to the Table view of the Structure page for the book table and click the Change link for the cover_photo, we see three additional attributes for the fields:
MIME type
Browser transformation
Transformation options
For a specific field, it is possible to indicate only one type of transformation. Here, the field is a BLOB field, so it can hold any kind of data, but for phpMyAdmin to interpret and act correctly on the data, the transformation system must be informed of the data format and the intended results. Accordingly, we have to ensure that we upload data that always follows the same file format.
We will first learn the purpose of those attributes, and then try some possibilities in the Examples of Transformation section.