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Projection ratio. One of the key characteristics of a video projector is its projection ratio, which is the projection distance divided by the image width. This means that, at a given distance, you will achieve a (min and max) image size that can be adjusted using the zoom (with the exception of short throw and ultra-short throw video projectors). For example, if the video projector has a ratio of 1.9 - 2.2 and it is positioned 4 metres from the wall, your image will have a minimum width of 1.82 m (4 divided by 2.2) and a maximum width of 2.10 m(4 divided by 1.9).
Resolution. A video projector has another key characteristic: its native resolution. This refers to the number of pixels that make up the projected image, expressed as columns x rows. The higher the number of pixels, the better the resolution. The most common resolutions are: SVGA 800x600 pixels, XGA 1024x768 pixels, WXGA 1280x720 pixels, FULL HD 1920x1080 pixels, and finally, 4K 3840x2160 pixels.
Output (lumens). You must also take the device’s output into account: the further the video projector is from the projector screen, the greater the required output in order to achieve a good brightness. If used exclusively as a home cinema, in the dark, an output between 1000 and 2000 lumens is sufficient.
By taking into account these 3 characteristics, which are linked exclusively to your video projector, you must define the projection distance that allows you to produce a good image resolution, with sufficient brightness. In order to determine the projection distance, you must know the size of your image (which corresponds to the measurement in cm from the left to the right of the white canvas of your projection screen), which you multiply by the projection ratio of the video projector (minimum and maximum) and thus determine the minimum and maximum distance for the installation of your video projector.
CALCULATION EXAMPLE FOR THE PROJECTION DISTANCE
Before purchasing your equipment, it is important to define the size of the image based on your video projector and the projection distance, or, inversely, the projection distance based on your image size and your video projector.
Minimum projection distance = image width x minimum ratio = 3 x 1.95 = 5.85 m
Maximum projection distance = image width x maximum ratio= 3 x 2.15 = 6.45 m
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