Mr Ghostface said:
A capture is not 1080p or any other broadcast resolution and although I know what you meant, a capture at a high resolution does not contain more information/detail than its source.

Oh yes it can. You can get a HD capture card for your PC and hook your HD line up to your PC and you can capture a 1080i broadcast at 1080p. I know of a HD capture card that captures at (1080i50, 1080i59.94, 1080i60,1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30, 720p50, 720p59.94, 720p60)