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Tiny yellow dots on a print-out representing the hidden code of an HP Color LaserJet 3700. The dots can be made visible by printing or copying a page and subsequently scanning a small section with a high-resolution scanner. The yellow color channel can then be enhanced with an image processing program to make the dots of the identification code ...
In computers, a printer driver or a print processor is a piece of software on a computer that converts the data to be printed to a format that a printer can understand. The purpose of printer drivers is to allow applications to do printing without being aware of the technical details of each printer model.
HP provides two different Universal Print Drivers: PCL 6 and emulation PostScript. PCL is a proprietary HP page description language, thus built in to their printers. Custom default values can be assigned with the HP Driver Configuration Utility. HP UPD is available in 32-bit or 64-bit, with 35 currently supported spoken languages for the ...
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A HP color laser printer with its cartridge drawer open showing the four toner cartridges inside. Color laser printers use colored toner (dry ink), typically cyan, magenta, yellow, and black . While monochrome printers only use one laser scanner assembly, color printers often have two or more, often one for each of the four colors.
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Testing of print devices is to be done in a semi-continuous mode at rated speed. It was noted that this type of testing procedure may not be typical of some common usage patterns for print devices, as in office settings for instance. Quote "the yield experienced by a given user may vary significantly from the yield measured by this test method".
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