| Video is often compressed by interlacing it, this is done by only showing every other horizontal line of the image being displayed. As this is done very quickly it appears, to the human eye, to be smooth and seamless. Sending images that are interlaced means that only half the bandwidth is needed and this is the basis of PAL and NTSC formats. The only drawback with interlaced images is that fast pictures may become blurred, HDTV and DVD on the other hand draw each line individually which means the image is clearer. |
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