How to update an ISO image using Jigdo?

I am trying to update the ISO image of Ubuntu using Jigdo . Can any one explain the exact way to do this ?

Jigdo only works with non-live images. Since Ubuntu dropped the Ubuntu Alternate image, the only image that will work with Jigdo is the Ubuntu Server image. Even then that image is now using some kind of live image to make installation faster so Jigdo won't be nearly as efficient as before. If you're just looking for ways to minimize the amount of data needed to update a 13.10 64-bit image, you're probably best to use zsync as it seems to be the most efficient way to do delta based updates of the live images.