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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.
As of 2021 the supplied printer-drivers support a total of 3,088 HP printer models; [3] many of these for low-end models are free and open-source (FOSS), licensed under MIT, BSD, and GPL licenses, but others (including all color laser MFC printers on the market for years) require proprietary binary blobs ("plug-ins").
Laser printing is commonly used by direct mail companies to create variable data letters or coupons. Pad printing, popular for its ability to print on complex three-dimensional surfaces; Relief print, mainly used for catalogues; Screen printing for a variety of applications ranging from T-shirts to floor tiles, and on uneven surfaces
Detail of a TFT display showing whole screen persistence artifacts TFT display showing persistence artifacts Image persistence on a BenQ GW2765HT IPS LCD monitor. Image persistence, or image retention, is a phenomenon in LCD and plasma displays where unwanted visual information is shown which corresponds to a previous state of the display.
The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, similar to a fluorescent lamp. The yellow phosphor is cerium-doped YAG crystals suspended in the package or coated on the LED. This YAG phosphor causes white LEDs to appear yellow when off, and the space between the ...