I right now cant figure out how to get the full image url from the thumbnail url. The thumbnail is not attached to the post but added programatically to the post. In order to fill the "og:image" meta data I want to use the full size image instead of the thumbnail (which is too small for facebook) For that reason i need to find a way to get the full image url from the thumbnail url.
Any hint highly appreciated
EDITED: Resolved this by getting the full image when I get the thumbnail ... sorry for posting