I've been asked to rename my images to better suit what they represent via keywords, for the purpose of SEO.
However, I've noticed that modifying the media images name within WordPress doesn't in turn modify the actual stored image names generated by WordPress, which are used within the HTML.
For example, I have a media jpg image titled "football". I need to rename this to "football-large-spotted". When I do this via the "football" media page, it doesn't change any jpg references on my page "about-footballs", which could be "football-320x320.jpg" when it should now be "football-large-spotted-320x320.jpg".