User blog comment:Harbumz/Introducing Vignette, Wikia's New Thumbnailer/@comment-3388044-20150306182511/@comment-3388044-20150306195704

 UPDATE : Eureka!! The full URL http://vignette1.wikia.nocookie.net/habbo/images/0/07/Raros.gif/revision/latest?cb=20130720183719&path-prefix=pt does indeed work.

But, it generates an incorrect destination filename. One just has to make sure to correct that destination filename before pressing the upload button.

Thanks for the help!