This add-on for Firefox allows RDFa-embedded metadata about images to be copied to the clipboard, and pasted into other applications. It also includes a function for pasting images with metadata into supporting webpages.http://commonsmachinery.se/labs/
links to plugins and applications that support pasting an image with metadata that has been copied by this add-on.
RDFa metadata is not very widespread, and when it it present it can often be difficult to know what resource on the page it describes. The README over on github list sites the addon has been tested on, describes how to use the context menu items, and also contains technical details on how it works with metadata:https://github.com/commonsmachinery/copyrdf-addon/blob/master/README.md