Hi Mark Averell,
Thank you for posting this question. Unfortunately this is not possible at this time. That said, this has been requested as a feature enhancement that is currently in review to be added to a future version of Jive, as you can see here: Images Rendered from Jive system (emailed blogs should contain images, not links) .
When I try to view that link, I get an "Access to this place or content is restricted. If you think this is a mistake, please contact your administrator or the person who directed you here" error message ...