Find a nice picture of the dark knight on the internet. I'd suggest you look for a photo with a simple design. A detailed pic would be very hard to cut and will consume a larger deal of time and nerves. In my case I chose the 90s animated Batman for it's slick and edgy design.

Use a photo manipulation program such as Photoshop or Pixlr to make your photo black and white. If you don't have Photoshop, just use Pixlr as it's free and no installation is required. Fool around with the brightness and contrast until you get an effect similar to the one in the photo.

When you're done you can either print your new image or recopy it by hand.