Other Alternative Text Tips
You do not need to include the phrases “image of” or “picture of” in your alternative text. Screen readers automatically announce this information to the user.
If your image is a logo that contains text, you must include this text in the alternative text description. Otherwise, you can just say that it is a logo.
Necessary text should not be included in an image if it is not repeated in the content of the course. Users using low vision software enlarge the elements on their screen to see and read the content. When images with text are enlarged, the text pixelates and becomes difficult to read. This also excludes sightless users who will miss the content entirely.
Do not use tables to control the layout of images with text. It is a good idea not to use tables at all, if possible. If you have text that must be in a table format, be sure to properly identify the header rows and columns so that every cell is properly named by screen readers.