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  2. Watermark - Wikipedia

    en.wikipedia.org/wiki/Watermark

    Stamp paper watermarks also show various designs, letters, numbers and pictorial elements. The process of bringing out the stamp watermark is fairly simple. Sometimes a watermark in stamp paper can be seen just by looking at the unprinted back side of a stamp. More often, the collector must use a few basic items to get a good look at the watermark.

  3. Digital watermarking - Wikipedia

    en.wikipedia.org/wiki/Digital_watermarking

    Watermarks are identification marks produced during the paper-making process. The first watermarks appeared in Italy during the 13th century, but their use rapidly spread across Europe. They were used as a means to identify the paper maker or the trade guild that manufactured the paper. The marks often were created by a wire sewn onto the paper ...

  4. Paper and Watermark Museum - Wikipedia

    en.wikipedia.org/wiki/Paper_and_Watermark_Museum

    The Paper and Watermark Museum is a museum of Fabriano, Italy. Based on the paper-making tradition of Fabriano, which is documented since the 12th Century, the museum focusses on handmade paper and watermark techniques in Medieval Italy .

  5. Security printing - Wikipedia

    en.wikipedia.org/wiki/Security_printing

    True watermark. A true watermark is a recognizable image or pattern in paper that appears lighter or darker than surrounding paper when viewed with a light from behind the paper, due to paper density variations. A watermark is made by impressing a water coated metal stamp or dandy roll onto the paper during manufacturing.

  6. Light-and-shade watermark - Wikipedia

    en.wikipedia.org/wiki/Light-and-shade_watermark

    A light-and-shade watermark, [note 1] is a watermark image produced in a chiaroscuro style. In a traditional watermark, an image is produced in paper fibers by contrasting shades of light and dark in places where the paper is made thinner or thicker during the printing process.

  7. Audio watermark - Wikipedia

    en.wikipedia.org/wiki/Audio_watermark

    An audio watermark is a unique electronic identifier embedded in an audio signal, typically used to identify ownership of copyright. It is similar to a watermark on a photograph. Digital watermarking is the process of embedding information into a signal (e.g. audio, video or pictures) in a way that is difficult to remove. If the signal is ...