1. Always add alt-text description to an image.
Depending on the purpose and use of the image, you do not have to be overly specific. If an image is purely decorative, then something simple like “The east end of WashU campus at sunset” is fine.
If the image conveys information related to the page, more specificity is required. An example would be a picture of alumni at Reunion on the 10th reunion page. Alt-text might read something like “Alumni gather in the Quad for a BBQ for their 10th Reunion.”
A photo of two donors about whom an article is written would have the most information as it has the most information to convey, including specific names and location. Example, “John and Jane Doe, AB’89, shake hands with Chancellor Andrew Martin at the 2020 Founders Day gala.”
2. Whenever possible, avoid placing text within images.
Text within images cannot be read by screen readers or search engines. When content cannot be represented appropriately outside of an image, provide an accessible, text-based version of the content.
3. Do not try to size images up to meet minimum requirements.
Sizing images up from a smaller size will result in poor and grainy resolution. You’re better served by finding another photo or omitting it entirely.