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I'm doing a project in invisible digital image watermarking using c#. In that project I want to do a task : After embedding watermark image in to cover image, it have to generate a secret code (like which watermark image information is embedded in to particular pixel in cover image)for help to extraction process. I'm new to watermarking.Please give valuable suggestions to accomplish this?
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Probably what you want is steganography: https://en.wikipedia.org/wiki/Steganography[^].

To get some particular help, you would need to indicate what kind of UI you want to use. For System.Drawing the solution would be different from WPF, or something else. Anyway, you will find a lot of information on CodeProject, so start with some search: http://www.codeproject.com/search.aspx?q=steganography+%28.NET+OR+C%23+OR+VB.NET%29&doctypeid=1%3b2%3b3%3b13%3b14%3b5[^].

—SA
 
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