text: difference between threshold and watermarking. anyone know?? i'm trying to understand the fundamental difference between setting thresold and setting watermark.? what in plain english it means ? while i understand threshold is something that when crossed becomes not usable. on the other hand there is low water mark and high water mark. when i associate threshold with watermark i don't see much difference. any answers would be greatly helpful the article below details watermarking and includes reference to threshold. threshold is the security measure (ie. how secure it is)of the watermark as far as i can make out. a threshold of zero would form a fragile watermark more susceptible to attack.