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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 used to print the document.
Manufacturers of printers or devices that use colour ink jet technology are meant to abide by this standard when testing for, and labeling the estimated yields of their products. The testing focused on sampling yields generated from typical business consumer printing applications.
Shortly after in 1994, Epson released the first 720 dpi colour inkjet printer, the Epson Stylus Color (P860A) utilizing the Micro Piezo head technology. Newer models of the Stylus series employed Epson's special DURABrite ink and used two hard drives (an HD 850 and an HD 860). [15] Epson R2000 printer
Usually when printing a dark color the printer will saturate an area with colored ink dots, and conversely, for a light color it will use fewer ink dots. The resulting graininess is hard to notice with yellow because yellow is perceived as a very light color, but sparse individual cyan and magenta ink dots, e.g. for a pale blue sky, can be ...
Some manufacturers incorporate the printer's head into the cartridge (examples include HP, Dell, and Lexmark), while others such as Epson keep the print head a part of the printer itself. In 2014, Epson introduced a range of printers that use refillable ink tanks. Epson's EcoTank printers offer a refillable ink tank system, which can ...
Printer steganography is a type of steganography – "hiding data within data" [30] – produced by color printers, including Brother, Canon, Dell, Epson, HP, IBM, Konica Minolta, Kyocera, Lanier, Lexmark, Ricoh, Toshiba and Xerox [31] brand color laser printers, where tiny yellow dots are added to each page. The dots are barely visible and ...