Using iPad As An X-Ray To Reveal Tattoos Under Clothes

I'm a photographer in New York working on a "Digital X-Ray" tattoo photo project. I'm turning my photographs into a book. I shoot the tattoo with my Nikon D5000, transfer the image to my iPad, scale and align the tattoo to the right spot and then shoot the "Digital X-Ray." 

More info: johnrennhack.com