Most projectors today offer native resolutions that qualify as widescreen formats. You'll generally want to match the aspect ratio (ratio of image width to image height) of the projector's resolution to the images you'll be watching most often, although you can also view material in narrower or wider formats. As long as the input resolution is one that the projector can accept—a detail you can check in the projector specs—it will either scale the image to the projector's native aspect ratio, which means stretching or shrinking it as needed, or keep the image's aspect ratio to avoid distortion and add letterbox bars (black bars above and below for wider formats or to each side for narrower formats). Almost all projectors today include aspect-ratio settings to let you choose which approach to use. (Fun fact: adding black bars to the sides on an image is often called reverse letterboxing or pillarboxing.) Note that the ability to show images with different aspect ratios than the projector's native resolution gives you some flexibility in matching the projector to the images you plan to watch. For example, you can use a native WUXGA projector, with its 16:10 aspect ratio, to watch movies or TV with a 16:9 aspect ratio. Keep in mind that if you set up a 16:10 projector to fill your 16:9 screen with the picture, you'll need a sufficiently wide black border at the edges to keep the letterbox bars from showing as brighter areas surrounding the screen.