Epson EMP-8300 Guide de l'utilisateur télécharger pdf (Page 115)

Appendix A: Projector Installation 115

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:

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.

16:9 image

4:3 image

16:9 image is 75% as high as 4:3 image

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 135 136

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Epson EMP-8300 Guide de l'utilisateur Page 115