The problem is the original question asked for a way for a flatbed scanner
to pick it up. A scanner isn't going to have the accuracy to reproduce it.
Tom
From: "Scott Gomez"
> There is a branch of cryptography called "steganography" that deals in
this
> sort of thing. A Google search on the word steganography will turn up all
> sorts of references for anyone with an interest.
>
> My (definitely imperfect) understanding of it is that it's a means of
> encoding "hidden" information in images for the purposes of cryptographic
> transmission or digital watermarking, among other things.
>
> ---
> Scott Gomez
>
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