CompTIA A+ Certification Exam Objectives .. GDI graphics device interface. GHz gigahertz. GUI graphical user interface. GPS. The Windows GDI builds the page and then sends it to the printer. A less- sophisticated method of communicating to a printer is to use the GDI (Graphics Device. GDI is actually a Windows component and is not specific to printers. Instead, it’s a series of components that govern how images are presented to both monitors.

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Network Connections Connecting a printer or multifunction device to a comptla isn’t just for offices anymore. So take that ancient ImageWriter dot-matrix printer and network it-I dare you! The color depth of a scan defines the number of bits of information the scanner can use to describe each individual pixel.

Figure illustrates the fomptia common to dot-matrix printers. To hear audio for this text, and to learn the vocabulary sign up for a free LingQ account. Most models send each page through four different passes,adding one color at each pass to create the needed results,while others place all the colors onto a special transfer belt and then transfer them to the page in one pass.

Photoconductive means that particles of these compounds, when exposed to light that’s the “photo” partwill conduct electricity. You’ll need to know how to support networked connections as well as the plug-and-play USB ones.

PostScript interpreters are embedded in the printing device. You will generally need to find and install third-party virtual printer software in order to print to the image format you desire on a given operating system. All flatbed gid, the most common cimptia of scanner, work the same way. Nearly every manufacturer has some sort of drivers and other software to create an interface between your computer and the scanner. Printers No other piece of your computer system is available in a wider range of styles, configurations, and feature sets than a printer, or at such a wide price variation.


Adjust your scanning settings to optimize for your project. A laser printer generates a raster image a pattern of dots of the page, representing what co,ptia final product should look like. It uses a roll of heat-sensitive plastic film embedded with page-sized sections of cyan bluemagenta redand yellow dye; many also have a section of black gdj.

CompTIA A+ Certification Exam Guide, A+ Chapter 27 Printers and Multifunction Devices (1)

This gives you a total of 16, color variations in the scanned image, which explains why some scanners refer to this as “millions of colors” in their settings. How Scanners Work All flatbed scanners, the most compia variety of scanner, work the same way.

Solid ink printers become a bit more affordable when you factor in the cpmptia of consumables. Resolution is most important when you’re printing complex images such as full-color photos, or when you’re printing for duplication and you care that your printouts look good.

CompTIA A+ Certification Exam Guide, A+ Chapter 27 Print

Assuming you have those and an account with the local telecom company, the process of faxing is pretty simple. Many people simply still prefer dealing with a hard copy, even as portable devices have proliferated.

When particles are struck by the laser, they are discharged and left with a. Using the laser, we can “write” an image onto the drum. A laser printer uses a chip called the raster image processor RIP to translate the raster image into commands to the laser. Sensors and Switches Every laser printer has a large number of sensors and switches spread throughout the machine.

Using RET enables laser printers to output high-quality print jobs, but it also requires a portion of the printer’s RAM.

Where older inks would smudge if the paper got wet or start to fade after a short time, modern inks are smudge proof and of archival quality for example, some inks by Epson are projected to last up to years. It used to be that you would physically connect the co,ptia to a single computer and then share the printer on the network.


Because PostScript is understood by printers at a hardware level, the majority of the image. Cloud and Remote Printing Blurring the line between traditional and cimptia printing, a variety of applications, such as Google Cloud Print, will install a virtual printer comptka your system that wraps up your document and sends it out over the Internet or other network to a cloud server, which eventually ends up routing it to a real printer for printing all without needing to have a driver installed for it.

First, the CPU processes your request and sends a print job to an area of memory called the print spooler. The amount of RAM in your system and to a lesser extent, the processor speed dictates how big a file you can handle.

CompTIA wants you to know specifically about a few of these options, so we’ll discuss them in a little more depth. Despite all of the talk about the “paperless office,”paper documents continue to be a vital part of the typical office. XPS provides several improvements over GDI, including enhanced color management which works with Windows Color System and better print layout fidelity.

This chapter examines the common varieties of printers and scanners, then looks at specifics of how a laser printer works. Figure shows how a dye-sublimation printer works. The heat method printers use tiny resistors compptia electroconductive plates at the end of each tube that literally boil the ink; this creates a tiny air bubble that ejects a droplet of ink onto the paper, thus creating a portion of the image see Figure If they did not, the PRT scR print screen key would not work with gdo printer.