Or, if using Firefox, you can right-click in the black area, select Page Info, click the Media tab, review the contained assets one at a time until you see the image, and grab its URL (
http://farm4.staticflickr.com/3727/9407286838_dc85246cef_b.jpg in this case). You should now see the image displayed by itself. Just copy the URL out of the Location bar, and paste wherever.