Quote:
Originally posted by snowcrash
So on a TV there is no overscan on the tops and bottoms, only on the sides?
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No, typical 4:3 TVs overscan by about 5% on all sides, including top and bottom. For the DV sample matrix of 720x480, this means that the central 648x432 pixels are visible on the screen.
When working with digital video, these 5% inset boundaries are referred to as the "action safe" region - the region where action in the frame is visible on the screen.
There is another set of inset boundaries at 10% (central 576x384 pixels) which is referred to as "title safe". This is the area where all titles and screen text/graphic overlays are supposed to be placed. This is so that the text and graphics are fully readable even if the consumer's TV is out of adjustment or old, and happens to overscan more than 5%.
As mentioned earlier in this thread, 16:9 TVs can come in different flavors -- some overscan 5% just like a 4:3 TV, while others behave more like computer monitors and show the entire frame.