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• W285884956 abstract "Choosing a Data/Video Projector Seven Questions to Consider Choosing a projector isn't as confusing as it may seem. Use these seven steps to help make the best decision for your application. 1. What are lumens and why are they important? The lumen is a measure of the amount of light. It indicates the total amount of light leaving the projector or falling on the screen. The brighter the image, the more lumens are measured. To measure lumens, a meter is used to measure the light that strikes one spot on the screen. The light level at a number of locations on the screen is measured and an average is determined. The average light shining on the screen and the size of the image on the screen determine how much total light is striking it. This total light is stated in lumens. The larger the image you want to project, the more the light is spread out. As the image gets larger, it appears less bright since there are less lumens in a given area on the screen. For example, if 2,000 lumens are used to form a 4' x 5' image (or 20 square feet), this results in 100 lumens in each square foot area. The value is found by dividing 2,000 by 20, which equals 100. If the image size is doubled to 8' x 10', the screen area is increased four times (80 square feet). The lumens are now spread across an area that is four times larger. Consequently, the number of lumens present at each square foot must be reduced by four, resulting in 25 lumens per square foot. This means the light level or brightness of the image will be reduced by four times. For image visibility, the light from the projector must exceed the background light that is naturally falling on the screen. Look at the screen without the image present and it usually appears white; this is due to the ambient room light. To become visible, the projected image must have sufficient light to exceed the background light. Thus, each installation has to deal with the particular conditions that exist for that screen and that room's normal light. In general, the more lumens produced by the projector, the brighter the screen image appears. Knowing the amount of lumens available from a projector makes it possible to determine the best size for image visibility. 2. How many lumens do I need to adequately present to my class? This depends on the ability to control the location ambient lighting, as well as the required image size. If you are presenting to a small audience (less than five people) in a relatively small room where lights can be dimmed, you may only need a projector that produces 500 lumens. If the room size increases and lights cannot be dimmed, you may need a projector that produces 2,200 lumens or more. 3. What is the native resolution of my computer? You need to know this because you will want to purchase a data/video projector that will handle your computer's current output. Native resolution is the normal resolution of the CRT monitor or laptop LCD screen. For monitors there are generally a number of possible settings; however, the inherent resolution of laptop LCD screens is defined by the number of pixels that up the screen. You can find the current resolution by looking at the display settings of the PC. You may want to think ahead about what your next computer will be and if the planned projector can handle your new computer's display resolution. Most new computers today are 1,024 x 768 (XGA) display resolution. Laptops are 800 x 600 (SVGA) or 1,024 x 768 (XGA). Some higher performance computers are using 1,280 x 1,024 (SXGA) resolution. Projectors today will handle their native resolution and will usually compress to the next higher level of resolution. Compression uses a software program to determine the best way to display a higher resolution. Today's compression methods are so effective that it is difficult to tell the image has been compressed. …" @default.
• W285884956 created "2016-06-24" @default.
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• W285884956 date "2001-10-01" @default.
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• W285884956 title "Digital Imaging Supplement -- Output" @default.
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