Piazza Castello in Torino, shot from Palazzo Madama. This has been shot with my iPhone 4s .
The app used to shot the image was ProCamera, cropping and adjustments were done using Snapseed, further editing was done using Modern Grunge and Phototoaster.
This photo has been featured on The App Whisperer Flickr Weekly Showcase, The App Whisperer is a great Mobile Photography blog that provides many useful resources such as tutorials and app reviews.
