The Options are as follows.
Thumbnail: Shows a small version of the picture. Useful for linking to large images
Full Size: Show the picture, as it was uploaded. Useful for resized images, which do not need to be linked
Title: Shows the name of the picture. Useful for linking images which are not legible as thumbnails.
File: Links to the file itself. Useful for Gallery/Lightbox scripts, or for documents and PDF’s
Page: Links to the full size picture on a formattted page that matches the rest of your site
None: No Link. Useful for images that have been inserted as “full size”.
