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Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
Color error: Stamp is printed in the wrong color(s). Paper error: Stamp is printed on the wrong type of paper which, e.g., may have a different watermark or color than intended. Perforation error: Perforations are missing on one or several sides or put in the wrong place (e.g. diagonally). As perforations may be removed by cutting them off ...
The resulting watermark is generally much clearer and more detailed than those made by the Dandy Roll process, and as such, Cylinder Mould Watermark Paper is the preferred type of watermarked paper for banknotes, passports, motor vehicle titles, and other documents where it is an important anti-counterfeiting measure.
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.
Early LaserJet models used a two-character display for all status messages. This printer is showing "00", for normal status. Paper out in the upper cassette would be indicated by alternating "11" and "UC". "PC" is an abbreviation for "paper cassette", [4] the tray which holds blank paper for the printer to use. These two-character codes are a ...
An invert may be characterized as an "inverted center" or "inverted frame" when the underlying paper is watermarked or otherwise carries a basic orientation. It is possible for a single-color stamp to be inverted relative to watermark, but this is called an " inverted watermark " rather than an "inverted stamp".
Barack Obama's birth certificate on security paper.. Security paper is a paper used in security printing that incorporates features that can be used to identify or authenticate a document as original, e.g., watermarks or invisible fibres in paper, or features that demonstrate tamper evidence when fraud is attempted, e.g., to remove or alter print such as amounts or signatures on a cheque.
Dot matrix printers are a type of impact printer that prints using a fixed number of pins or wires [2] [3] and typically use a print head that moves back and forth or in an up-and-down motion on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper. They were also known as serial dot matrix printers. [4]