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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 ...
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 ...
ESC/P, short for Epson Standard Code for Printers and sometimes styled Escape/P, is a printer control language developed by Epson to control computer printers. It was mainly used in Epson's dot matrix printers , beginning with the MX-80 in 1980, as well as some of the company's inkjet printers .
A CMYK printer instead uses light-absorbing cyan, magenta, and yellow inks, whose colors are mixed using dithering, halftoning, or some other optical technique. [ 10 ] Similar to electronic displays, the inks used in printing produce color gamuts that are only a subsets of the visible spectrum, and the two color modes have their own specific ...
Overlapping layers of ink in printing mix subtractively over reflecting white paper, while the reflected light mixes in a partitive way to generate color images. [ 9 ] : 30–33 [ 19 ] Importantly, unlike additive mixture, the color of the mixture is not well predicted by the colors of the individual dyes or inks.
Ultraviolet light penetrates the original and neutralizes the light-sensitive diazonium salt wherever there is no image on the master. These areas become the white areas on the copy. Once this process is complete, the undeveloped image at the locations where the UV light could not penetrate can often be seen as very light yellow or white marks ...
Virtual PDF printers for Microsoft Windows: Bullzip PDF Printer – there is a free version; CutePDF; DoPDF – this is a simplified version of NovaPDF; PDFCreator – a Ghostscript-based virtual printer for Microsoft Windows, with user interface for advanced options (security settings, combining multiple documents, etc.).
If the destination address was local, but referred to a user name not found in the local password file, the message sent back to the originator of the email was the announcement that the person they were attempting to communicate with was not a typewriter.