The new Fiddler beta has an improved ImageView extension, which exposes (often surprising) metadata in image files:

http://www.telerik.com/automated-testing-tools/blog/eric-lawrence/13-01-17/fiddler-imageview-enhancements.aspx

http://www.telerik.com/automated-testing-tools/blog/eric-lawrence/13-01-17/fiddler-imageview-geolocation.aspx