Clarity WN-5040-720 manual Scaling and Cropping

3.4 Spreading One Picture Over a Wall

3.4.1 Scaling and Cropping

Sometimes the picture does not fit the wall. If the source picture is video from a DVD, the aspect ratio is probably 1.77 (16x9), the same as HDTV.

The aspect ratio of a picture is its width divided by its height. 1024 ÷ 768 = 1.33

The aspect ratio of a Margay is 1.77 (16x9), the same as HDTV. When the source picture’s aspect ratio is not the same as the Margay wall, you have to do something to make the picture fit. You have some basic choices:

•Fill the area both ways. This will produce some distortion in the picture. Circles will not be round.

•Put the picture in without distortion and crop off the sides (or top and bottom).

•Put the picture in without distortion and fill the extra space with black or some other solid color.

•Force an aspect ratio, such as 16 x 9 or 4 x 3.

This is a 1.77 picture shown on a 3x3 wall of Mar- gays. The picture fills the wall nicely, and there is no distortion or cropping.

A picture with an aspect ratio of 1.77 is shown on a 3x3 wall of Margays.

Let’s start with a 1.33 (4x3) picture, the aspect ratio of normal TV, and put it on this same wall of Mar- gays. Here is the original picture.

Scale Mode determines how the picture will be made to fit the wall.

•Fill All means that the picture will touch the bor- ders of the wall all around, even if this means stretching (and distorting) the picture in one direction. The picture had to be stretched side- ways to fill the screens.

•Letterbox means expand the picture until the first edges (top-bottom or left-right) touch the border of the wall, then fill in the other sides with a solid color.

•Crop means expand the picture until the second edges touch the border and let the other edges of the picture fall outside the wall and get cropped. Here the width is filled, there is no distortion, but

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