The magician pulls out his/her iPhone and takes a photo of a volunteer. Phone is put down for the time being. A deck of cards is pulled out and the volunteer is asked to pick a card. The chosen card is put face down on top of the photo.
The volunteer is asked to press/rub on the back of the card. When the card is lifted up an impression of the chosen card can be seen in the photo that was just taken!
Now press the "i" info icon and flip the view. You now have the option to email the volunteer a souvenir of the photo with the ‘ghost’ card or save the photo to your photo library.
FOR IPOD TOUCH USERS:
Instead of the selecting from the camera or camera roll, you must pick a photo from your photo library. Everything else is the same.