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HP Digital Projectors - Matching Computer and Projector Resolutions


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, a projector with the same native SVGA resolution provides the sharpest and cleanest image. Similarly, a computer with XGA output will get the best picture from a projector that has XGA as its native resolution.

Native and non-native resolutions

Figure 1: Example of native (true) resolution

Computer and projector are at the same resolution. (Simulated image, enlarged 300%)

Figure 2: Example of non-native resolution

Computer is at a higher resolution than the projector (compression). (Simulated image, enlarged 300%)

Converting different input formats

Projectors are capable of projecting input signals other than their native resolutions. For example, an XGA computer can usually be hooked up to an SVGA projector. The projector will automatically convert the incoming 1,024 x 768 signal to its native 800 x 600 output. However, there is always a loss of sharpness and detail in the process, so the picture is not quite as sharp as if the incoming signal had been the same format as the native resolution of the projector.

This loss of sharpness also occurs if an SVGA computer is plugged into a higher-resolution XGA projector. The image is decent, but the conversion from the 800 x 600 input to a 1,024 x 768 output will produce some fuzziness.

The projector's process of converting a different input format to its native output format is called "scaling." Projectors are good at scaling, so any resulting image fuzziness is relatively minor and the image is very adequate no matter what the source.

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