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It's because (like News 24) it is produced in widescreen, however when the signal is sent out it's only as 4:3. Because there might be parts of the graphics not within the TV-safe areas, or for other reasons, they zoom the image out a bit so that you can see a little more.
Basically it's not meant to be a part of the presentation, it's just more of a side effect. It also strikes a balance between standard (older) 4:3 TV's and widescreen ones - on a widescreen TV, with the zoom settings done right, the black bars are on the sides.
This article on Wikipedia does a good job of explaining it.
yaloh posted:
Any idea why BBC World News always has 2 bars across at the top and the bottom of the screen while having the image full on other programmes?
It's because (like News 24) it is produced in widescreen, however when the signal is sent out it's only as 4:3. Because there might be parts of the graphics not within the TV-safe areas, or for other reasons, they zoom the image out a bit so that you can see a little more.
Basically it's not meant to be a part of the presentation, it's just more of a side effect. It also strikes a balance between standard (older) 4:3 TV's and widescreen ones - on a widescreen TV, with the zoom settings done right, the black bars are on the sides.
This article on Wikipedia does a good job of explaining it.