John,
I don't think so. If YOU can't see it, neither can the scanner.
You can add a digital watermark to the picture AFTER it is scanned, but
that's not really that much security.
Tom
From: "John Hudson"
>
> Are there any means whereby a professional photo lab can embody a symbol
> or mark into a photo print during the printing process which would be
> invisible to the human eye but which would be detected by a scanner and
> would show up very clearly on the digital image file?
>
> I know that invisible marks can be embodied into scanned image files
> [Digimark?] but is there anything similar for hard copy photographs?
>
> Any help will be greatly appreciated.
>
> John Hudson
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