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Widescreen television formats have made an appearance in recent years. In Europe, widescreen (16 : 9 format) has been used widely for a number of years using standard definition broadcasting while in North America, widescreen has only been used with high definition broadcasting. In both cases, the change of shape has to be handled. All widescreen televisions will have their own way to deal with a 4 : 3 ratio image. The simplest method is to center the image on the screen and leave side curtains (black or gray areas) to fill the remainder of the screen. Most will allow the image to be stretched to fill the screen with the result that all images are mis-shapen. The last common method is to enlarge the whole of the image so that the width of the image fills the screen and the top and bottom of the image are lost. Some televisions allow the image to be panned to bias the zoomed image towards the top or bottom depending on the content. Broadcasters often have to cope with the same issues. Although the channel might be broadcast in widescreen, some of the content may still be 4 : 3. The image will be handled in the same ways as a domestic television but it is important to note that if side curtains are added to the image, the output is still in the wide screen format and the image cannot then be resized on the domestic television. In standard definition widescreen, a "wide screen signal" is used (WSS) within the television signal to tell the receiver what format the image is in. It is this WSS signal that is detected to establish what shape of image the television needs to use. WSS is never used in high definition as all HD images are widescreen.

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Q: How do wide screen TV's deal with non-wide screen broadcasts?
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