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
-----Original Message-----
From: Bachofen [mailto:mbachofen@xxxxxxxxxxxxxxx]
Sent: Monday, September 17, 2001 20:19
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] Image copyright
Yeah,
I thought about that too, having taken those color-blind tests as a
kid. What about people who may be able to see those bits on the original
photo though. I was thinking of some sort of clearcoat which when the
original photo is viewed can't be seen, but when scanned a part of the
coating would be encoded. I don't know just brainstormin'
Matt
Enjoy when you can, and endure when you must.
~Johann Wolfgang von Goethe (1749 - 1832)
*********** REPLY SEPARATOR ***********
On 9/17/01 at 7:51 PM W.Xato wrote:
>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
>
>For where to go when you know when
>-PhotoDates-and-Places@xxxxxxxxxxxxxxx
>
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