Epson 475Wi Projector - Specs

Contrast Ratio is the difference between the whitest white and the darkest black colors the display can show. The greater the contrast, the better the screen and the subtlety of colors it can display.
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Type of technology that is used to project the images.
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Projector brightness is measured in ANSI lumens. ANSI stands for "American National Standards Institute", who created a scale by which to measure the overall brightness value for projectors. The measurement represents the average value of 9 points on the projected screen image. The higher the ANSIv lumens value the brighter and sharper the projected image will be. \r\nWith a measurement of less than 1000 lumens, viewing can be hard unless in a darkened room. With a measurement of more than 3000 lumens, and it may be possible to see even in a sunlight filled room. There are several additional variables to consider as well as lumens, such as lamp bulb type, LCD technology and contrast ratios. If any of these variables is adjusted, it will make two projectors with the same lumens measurement display images of different quality. For example, a projector with a halogen lamp will appear darker than a projector with a metal-halide bulb.
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Platform refers to the type of machine with which a hard drive is compatible.
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LCD projectors create images through a liquid crystal display and are the most modern form of projection equipment. Overhead projectors are older projectors for hard copy transparencies.

DLP, or Digital Light Processing projectors are of the same generation as LCD and offer high quality resolution and brightness.

CRT projectors are older technology and based on three color light projection.
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High-Definition is the top of the line, all digital format for broadcasting and viewing TV programming. With HD, you see images at a higher resolution than you have ever viewed on a home screen before. This clarity is delivered in a crystal clear, widescreen format, with CD quality sound: as if a movie theater was dropped in your living room.
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Image ratio refers to the relation of the width of the image to the height. While you can change the size of the image, the ratio stays constant.
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Native resolution refers to the resolution of the computer output signal via the projector. Usually, the input signal (native) from a computer is automatically converted to the projector's own resolution. For this conversion process, the resolution is achieved by hardware/software image manipulation called re-scaling.
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Projectors can create a low hum or background noise from the cooling fan. Here the average noise made by the projector is measured in dB (decibels).
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Depending on the type of use and portability needed, weight is an important consideration when selecting a product.
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