About: http://webisa.webdatacommons.org/80724032

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	You get get a GIMP plug in courtesy of RobA (I think he has a link to it on his sig) to do that process or in that thread is a script which will run it automatically using image magick.
http://www.w3.org/ns/prov#wasQuotedFrom	cartographersguild.com