I don't know about Garamond specifically, but copyright applies to images also, and some fonts are copyrighted. In fact, with the automatic copyright that came in with the copyright changes in the 1970s, all modern fonts are copyrighted. Many have been released for public use, but if you want to use an unusual font in your work, you should check to make sure that it is available.
Computer fonts are copyrightable as software, and particularly novel font shapes can register a design patent. But in general there's no legal barrier to redistributing images of type specimens (or even producing a clone font by tracing the outlines).
