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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 ...
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".
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. For example, watermark fluid may be applied to the back of a stamp to temporarily reveal the watermark. [4]
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 ...
The first documented fire-starting printer was a Stromberg-Carlson 5000 xerographic printer (similar to a modern laser printer, but with a CRT as the light source instead of a laser), installed around 1959 at the Lawrence Livermore National Laboratory and modified with an extended fusing oven to achieve a print speed of one page per second. In ...
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.