![]() For the example above, it should look like this: 10ft (screen width) x 1.2 (first number in the throw ratio) = 12ftĪccording to this equation, if you place your projector 12ft away, the picture will perfectly fit the proportions of the screen with only minor adjustments to the lens’ zoom needed afterward. So, screen width x throw ratio = throw distance. Take the width of the screen and multiply it by the first number in the throw ratio. How far away should the projector be positioned from the screen? Let’s do the math and find out! Let’s say you’re setting up an XGIMI projector in your living room that has a throw ratio of 1.2:1, and you’re using a screen 10ft in width. The throw ratio tells us what image size we can project from a certain distance away. Throw ratio is the relation between the throw distance (the distance between the projector's lens and the projected image) and the width of the projected image: Throw Ratio = Throw Distance / Image Width For any given projector, the width of the image (W) relative to the throw distance (D) is known as the throw ratio D/W. The throw distance td is equal to the throw ratio tr times the screen width w.This distance determines where the projector will sit in your classroom relative to the projection screen. ![]() Look for information about screen size and distance, typically expressed as 'screen size distance' from the screen. Given the projector throw ratio and the screen’s width, the following formula will calculate the throw distance. Throw Ratio Throw Distance / Image Width, which can calculate a distance as 8.2ft from the wall for projection of a 100-inch image with a 16:9 aspect ratio (image width is approximately 7.2ft). The minimum and maximum throw ratio should be documented for every projector and is needed to calculate the throw distance. The distance varies by the lens used in the projector and the screen’s size. How to Calculate Projector Throw DistanceĪ projector needs to be installed a specified distance from the screen to allow the image to fill the screen correctly. There have been a few questions about the screen calculator on Projector Central, so rather than guess or assume anything I just asked them about it. Use the following chart as a guide for choosing the right screen brightness for your room.Ĭhart showing the optimal screen brightness for various types of rooms 0-15 ft-L You might be wondering how many foot-lamberts you need for a good experience? SMPTE recommends at least 16 foot-lamberts for a dark cinema. The brightness in foot-lamberts is equal to the projector lumens times the screen gain, divided by the area of the screen in square feet. Use the following formula to calculate the brightness of your screen.įt-L = lumens × gain / screen square feet Some screens also incorporate gain to increase the amount of light reflected to the viewers, increasing the brightness. The projector’s luminosity and the size of the screen both contribute to the overall brightness. The screen’s brightness is typically measured in foot-lamberts or candela per square meter. You can also use an aspect ratio calculator to solve the ratio.Ī projector screen’s brightness is one of the most important factors in a good cinematic experience. Then, divide each dimension by the greatest common factor to get each part of the aspect ratio. Find the greatest common factor between the screen’s width in pixels or inches and the height in pixels or inches. It’s possible to calculate a screen’s aspect ratio given either the image’s resolution or the width and height. Don’t forget to account for the ideal screen height for the optimal viewing experience. We go into much more detail about calculating screen size on our screen size calculator. Screen height = AR h × diagonal / √(AR w 2 + AR h 2) The screen width is equal to the aspect ratio width AR w times the screen diagonal divided by the square root of the aspect ratio width AR w squared plus the aspect ratio height AR h squared. Screen width = AR w × diagonal / √(AR w 2 + AR h 2) Use the formulas below to calculate a screen’s width and height. You can calculate the size of a projector screen given the diagonal measurement using the aspect ratio and the Pythagorean theorem. Try our TV size and distance calculator to calculate the optimal viewing distance for a television. The viewing distance d is equal to the screen width w divided by 2, times the tangent of 180 minus the viewing angle θ divided by 2. Use the following formula to calculate the viewing distance for a given viewing angle. ![]() The Society of Motion Picture and Television Engineers (SMPTE) recommends a viewing angle of 30°. THX recommends a viewing angle of 26° to 40°, with a preferred angle of 36° to 40° if possible. ![]() Various standards define the proper viewing angle for viewing content on a projection screen. The optimal viewing distance from a screen depends on the screen’s width.
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