Re: Water Marking

**"Christopher P. Lindsey" t*@spamfodder.com**

> Saxon Holt's last post brings up a question.  Which water marking software 
> do you think is best, if you use water marking?  If not, what are you using 
> for security?

Hi Doreen,

   When you mention watermarking, are you talking about visible watermarks
   (like a copyright notice in the corner or a transparent notice through
   the middle) or an invisible watermark?  Or both?

   Visible watermarks can be added like Saxon suggests -- through Photoshop
   or any other editor.  I've automated the process on my systems to 
   place text in the lower right hand corner by just giving the script
   a list of directories to convert.  It runs through all of the files that
   it finds and resizes, sharpens, and edits them as necessary.

   Unfortunately, they're only written to work on a UNIX system.

   Invisible watermarks are the type that DigiMarc and other commercial
   services secretly embed in an image.  It's actually called 
   'steganography', and refers to the practice of hiding something within
   something else (in this case, hiding copyright information inside of your
   image).

   This URL might help:

      http://www.watermarkingworld.org/faq.html

   One other thing to remember about invisible watermarks: they degrade
   the quality of the image depending on the amount of data that's
   stored and how 'robust' you want it to be.  A good example is at

     http://www.petitcolas.net/fabien/steganography/image_downgrading/index.html

   There's a good list of commercial software at

     http://cosimo.die.unifi.it/~piva/Watermarking/wm_sw.html

   I'm not sure what free software is available for Windows, but I can
   look into it if there's enough interest.

Chris

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