On Fri, Jul 03, 2009 at 12:21:42PM -0400, Graydon wrote:
> >
> > The K-7 has a field where you can enter the author and copyright info
> > and it's included in the file.
> 
> Well, sure, but that's not necessarily going to be difficult to remove
> from the EXIF info.  It's kinda like steganography in the image file --
> it's great until someone resizes the image.

Back in the days when Digimarc offered a free personal license for up to
100 images I used to use their digital watermarking.  I found that it was
quite robust - even after much manipulation the watermark was detectable.

One time, just as an exercise, I:

   o  Watermarked an image

   o  Resized and cropped
 
   o  Printed

   o  Scanned the print (at a different resolution)

The resulting image still carried a strong digital watermark!


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