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Which Resolution is best for you...
Basically, just ask yourself what your needs are...
If your main use of the system is for Power Point style graphics, charts, graphs, and general business presentation, you do not need to pay extra for high resolution equipment. SVGA resolution is perfect for this kind of work, and the best choice for the money. However, if you are often presenting materials like Excel spreadsheets with a lot of numeric data on the screen, you will probably be happier with XGA resolution. This format is able to produce a clearer and more legible image of small numbers and other data. Although if you are projecting engineering drawings or other images of a highly detailed and technical nature, you will probably need a very high resolution SXGA projector to produce a sufficient image for your purposes.
Projection Resolution to match your computer
The best resolution for your projector is the resolution of the computer you intend to use with it. If you typically use a notebook computer with SVGA resolution, you will want a projector with the same native SVGA resolution in order to get the sharpest and cleanest image. Similarly, if you normally use a computer with XGA output, you will get the best picture from a projector that has XGA as its native resolution. Most of the projectors on the market today are capable of projecting input signals other than their native resolutions. However, there is always a loss of sharpness and detail in the process, so you will end up with a picture that is not quite as sharp as if the incoming signal had been the same format as the projector's native resolution. This loss of sharpness also happens if you plug an SVGA computer into a higher-resolution XGA projector. You will usually get a decent image, but the conversion output will produce some fuzziness that you may not appreciate after having spent the money for an XGA projector. The projector's process of converting a different input format to its native output format is called "scaling." Some projectors are very good at scaling, so the resulting image fuzziness is relatively minor, and the image is very adequate no matter what the source. The quality of scaling varies widely among projectors and it is constantly being improved. If scaling is an important consideration, be sure you witness a demonstration, as you would use it.
Projector Buying Tips:
An Introduction to Projectors
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