Nielsen Bookscan, the leaders providers of book-related data, have recognised Scott Kelby's "The Digital Photography Book" as the best-selling book ever on, well you guessed it - digital photography.

Over 250,000 copies of the book are currently in print, and include nearly 200 of the most guarded photographic "tricks of the trade".

It also teaches readers how to get the most out of their photographs, from making them sharper and more colourful, to giving them that professional finish they are looking for.

And Kelby certainly knows what he's talking about. He's written a whole host of books on photography, photo-editing and even one on how to get the best out of your iPhone. A multi-talented man it seems.