On the institution Install Form you will be asked for the following:
Please upload default institutional image(s). Minimum size of 1100 x 330 pixels; larger images will be resized/cropped.
This request for a banner image is often confused with a school logo so we’d like to provide some clarification.
The institutional page banner image(s) will be available to your faculty and staff as default and suggested images they can choose when designing their front pages with Design Tools. These images should represent your institution.
Below are examples of how your banner images will be used.