There could be a way to mark a digitally produced
photo. Remember the color-blind test that hides
certain number is a bunch of colored dots? If you had
colored inks whose spectral response was different
than the sensivity of the human eye, you could hide
informationthere without being able to visually see
it.
Warren
>
> 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?
> >
=====
Warren Xato
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