Epson V11H068920 User Manual - Page 115
Converting Between Diagonal Size and Width or Height, Converting Between 16:9 and 4:3 Image Sizes
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Converting Between Diagonal Size and Width or Height The calculations on the previous pages use the diagonal length of an image to indicate its size. ■ Use these formulas if you want to find out the diagonal size of a 4:3 image from its width or height: Diagonal size = 5/4 × width Diagonal size = 5/3 × height ■ Use these formulas if you want to find out the width or height of a 4:3 image from its diagonal size: Width = 4/5 × diagonal size Height = 3/5 × diagonal size Converting Between 16:9 and 4:3 Image Sizes The image size calculations on on the previous pages assume that you're projecting a 4:3-sized image. If you want to project a 16:9 (widescreen) image, you'll first need to determine the corresponding size of a 4:3 image before using the calculations. Since the projector's native aspect ratio is 4:3, the image height is reduced when you project a 16:9 image: 16:9 image 16:9 image is 75% as high as 4:3 image 4:3 image If you know the height of the 16:9 image you want to project, multiply it by 20/9 to determine the diagonal of the corresponding 4:3 image. Then use the image size calculations to determine the projection distance. If you've already used the projection distance to calculate the diagonal of a 4:3 image, multiply it by 9/20 to determine the height of the corresponding 16:9 image. Appendix A: Projector Installation 115