Thanks for this. A very nice shot of Siena too.
BTW as with everything nothing is 100 % that way. A dramatic sky can be effective too! Heres one done with tiltshiftmaker ( I will now re-do with GIMP)
http://www.flickr.com/photos/pollobarca/5009490296/
Dolomites in Italy.

A question- can this technique in GIMP be applied as a batch ? I want to do a time lapse movie with this. But applying one at a time to 1000+ images
will be boring at the least.
All the best

paul