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Subject:RE: Hidden digital signature in a graphic From:"Steve Hudson" <steve -at- wright -dot- com -dot- au> To:"TECHWR-L" <techwr-l -at- lists -dot- raycomm -dot- com> Date:Tue, 27 Nov 2001 13:26:02 +1100
John, this can be as simple as setting up a pale watermark and blending it
into your pictures. You will achieve comparable results with any
fancy-schmancy tool. This sort of process is usually batchable one way or
another.
The main problem is that if people want to remove the watermark, they can,
no matter how hard you try. Just a touch of blur/sharpen or even some sort
of color naturalisation will defeat most systems.
Another, slightly more technical way is to include a CHUNK of text, marked
as text, after the bitmap chunk. With any luck, folks won't realise its even
included in the binary file, giving you a signature that travels with it.
Steve Hudson , HDK List MVP
Wright Technologies Pty Ltd (Aus)
-----Original Message-----
From: John Posada
Hi, guys...
I have about 300+ images, in jpg form, that I'm distributing via CD
to a list of people.
I don't want the copyright message to be visible with the naked eye,
but within the code, so to speak. Without pasting copyright
information across each one, I'd like to, in batch mode, place a
copyright message IN the image so that with the correct viewer, be
able to observe the signature if it exists.
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