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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 ...
A perspective view of a dandy roll in accordance with the invention of a conventional paper-making machine incorporating watermarks into the paper. Traditionally, a watermark was made by impressing a water-coated metal stamp onto the paper during manufacturing. The invention of the dandy roll in 1826 by John Marshall revolutionised the ...
Watermarks were first introduced in Bologna, Italy in 1282; as well as their use in security printing, they have also been used by paper makers to identify their product. For proofing the authenticity, the thinner part of the watermark will shine brighter with a light source in the background and darker with a dark background.
"LOAD" is an instruction to refill the paper tray. "LETTER" is the standard paper size used in the United States and Canada. Thus, the message is instructing the user to refill the paper tray with letter-sized paper. Other messages that might be seen include "MP LOAD LEGAL", meaning the "MP" (multi-purpose) tray needs to be filled with legal ...
The original style of CAP code, developed in 1982 by Kodak along with the Motion Picture Association, is a series of very small dots printed in the picture area of a film print. The original instance of CAP developed by Kodak is a technology for watermarking film prints to trace copies of a print, whether legal or not.
A number of authentication systems are known by the general term of "watermarking" methods, since they rely on embedding authentication information into another information bearer, by analogy with the watermarking of paper.
This is done to distinguish stamps with the same color, perforation gauge and denomination but which were printed on paper with different watermarks or without any watermarks—i.e., the only way to positively distinguish a 3-cent, 1908 issue, with double-line watermark, from a 3-cent, 1910 issue, with single-line watermark, is to test for ...