Without a camera with a macro setting, you can do this with a digital camera. Where most folks mess up is in trying to get too close to the object to take the picture and the camera cannot focus on the object. You want to be no closer to the object than your camera can focus.
Take the picture.
Using a simple photo editor, crop the image and expand the size to what you like.
If you are using a 12 megapixel camera like nate's, your cropped version will still be a higher resolution than digital cameras from just a few years ago.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011