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What is a “watermark\ ?

April 26, 2017watermark

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What is a “watermark\ ?

5 Answers

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A watermark is a recognizable image or pattern in paper that appears lighter when viewed by transmitted light (or darker when viewed by reflected light, atop a dark background). A watermark is made by impressing a water coated metal stamp or dandy roll onto the paper during manufacturing. Watermarks were first introduced in Bologna, Italy in 1282; they have been used by papermakers to identify their product, and also on postage stamps, currency, and other government documents to discourage counterfeiting.

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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.

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A translucent logo that is embossed during the papermaking process while the paper slurry is on the dandy roll. Reference, dandy roll.

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A watermark is simply a small, dynamically defined, overlay. It is usually applied on top of a page. For example, you might want a second copy to have a watermark of ‘file copy’ in faded large print.

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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.