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Have you considered doing something similar for business cards?

It's hard to do this for business cards due to the combination of low-resolution of the built-in camera and the focal length of the lens.

It's possible using something like Griffin's Clarifi (macro lens), but you can't count on everyone having one.

Exactly. I'm optimistic the next major revision of the iPhone hardware will have a better camera so maybe then.

It's not mobile though