Video, Sound and printer Chapter 4 Video, Sound and printer

Video and Sound Monitors Video Cards Ergonomics and Monitors Data Projectors Sound Systems Printer

1. Monitors Most common output device Connects to the video port

1. Monitors Monochrome - One color with black background Grayscale Monitor- Varying degrees of gray Color Monitor - Display 4 to 16 million colors

1. Monitors Cathode Ray Tube (CRT) Liquid Crystal Display (LCD) Plasma monitor LED (light-emitting diodes)

1. Monitors Plasma monitors Use neon or xenon Gas is excited to produce light

1. Monitors Size of monitor Measured in inches (2.54 cm/in) Teaching tip It is helpful to draw the relationship between viewable and actual size.

Better cards result in better output Have their own processor and RAM 2. Video Cards Better cards result in better output Have their own processor and RAM Modern cards have up to 4 GB Insider information The two leading video card families are ATI’s Radeon and NVIDIA’s GeForce line. Both offer exceptional graphics cards ranging from $50 to $600.

3. Ergonomics and Monitors Eyestrain Fatigue of the eyes Steps to avoid Choose a good monitor Place the monitor 2 – 3 feet away Center of screen below eye level Avoid reflected light http://www.khmerscoop.com/good-knowledge/13934

Digital Light Projectors (DLP) 4. Data Projectors LCD projectors Most common type of projector Require a darkened room Digital Light Projectors (DLP) Can be used in a lighted room Insider information A projector is rated in lumens. This is a measure of how bright the projector is. Higher lumens ratings result in a brighter projector. For a guide to lumens ratings, see http://www.projectorpeople.com/tutorials/lumen-guide.asp.

5. Sound Systems Sound card Can be connected to several devices

1. Commonly Used Printers Impact printers Non-impact printers 2. Comparing Printers 3. High-Quality Printers

6. Commonly Used Printers Impact printers Generate output by striking the paper Uses an inked ribbon Non-impact printers Use methods other than force Tend to be quiet and fast

6. Commonly Used Printers Dot matrix printers Impact printer Used to print to multi-sheet pages Speed measured in characters per second Dot Matrix Print Head Teaching Tip Figure 4B.5 on page 163 provides an excellent rendering of how the print head works. Be sure to refer to the image as you teach.

6. Commonly Used Printers Ink-jet printers Non-impact printer Inexpensive home printer Color output common using CMYK Cyan(blue), magenta (red) , yellow, black Speed measured in pages per minute (ppm) Quality expressed as dots per inch (dpi) Insider information Nearly all of the electronics for the printer is kept in the ink cartridge. Thus, when the cartridge is replaced the printing components of the printer are replaced. Refilling cartridges is OK, but should not be reused more than 2-3 times.

Dots Per Inch

6. Commonly Used Printers Laser printer Non-impact printer Produces high quality documents Color or black and white Speed measured in pages per minute Quality expressed as dots per inch (dpi) Insider information The laser printer works on a similar process to a photocopier. The first photocopier as we know it today was invented in Astoria NY in 1938 by Chester Carlson and Otto Kornei.

6. Commonly Used Printers All-in-one peripherals Scanner, copier, printer and fax Popular in home offices Prices are very reasonable

6. Comparing Printers Determine what you need Determine what you can spend Initial cost Cost of operating Image quality Speed

6. High-Quality Printers Photo printers Produces film quality pictures Prints very slowly Prints a variety of sizes

6. High-Quality Printers Dye sublimation printers Produces realistic output Very high quality Operation costs are high Output is very slow

6. High-Quality Printers Plotters Large high quality blueprints Operational costs are low Output is very slow

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