What is Watermark

What is Watermark?

What is watermark? Although different authors use different meanings for the word 'watermark', it is mostly agreed that the watermark is one, which is imperceptibly added to the cover-signal in order to convey the hidden data.
The watermark is just an image overlay that will be placed on any images.

A watermark is a embedded overlay on a digital photo consisting of text, image, logo, or copyright mark. The purpose of a watermark is to identify the work and discourage its unauthorized use. Though a photo watermark can't prevent unauthorized use, it makes it more difficult for those who may want to claim someone else's photo or art work as their own.

Another type of watermark is the digital watermark, pioneered by AoaoPhoto, provide a service for embedding digital info into pictures that is undetectable during normal use, but enables tracking and identification of the pictures.