About: http://webisa.webdatacommons.org/387038678

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	I second to @MikeW. Shooting a grey card and adjusting the WB later in batch is the easiest solution if you are too picky about natural looking colors and perfect exposure.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com