Jay R. Ashworth wrote:
On Sat, May 21, 2005 at 02:18:54PM -0400, Michael T. Dean wrote:
i think you mean 1080p?
Actually, 1080p and (true) 1080i both have the same resolution.
Not really.
1080p is a 1080 scanline, 30 *frame* per second format.
1080i is a 540 scanline, 60 *field* per second format.
Or, actually, 1080i has 1080 *interlaced* scan lines sampled
temporally. That means that each field has 540 scanlines, but if those
540 scanlines are shown on a display having only 1920x540 resolution,
the display would be--by definition--not interlaced (it would be
540p--and a very bad match of vertical and horizontal resolutions :).
Instead, 1080i--to be interlaced--requires a 1920x1080 display to show
the 1080 interlaced scanlines--drawing 540 scanlines per field and 1080
scanlines per frame.
Therefore, I submit to you that 1080i *has* 1920x1080 resolution.
And, yes, it is possible to send a 540p signal to a device expecting
1080i input; however, the signal is *not* 1080i. Therefore, this cannot
be used as proof that 1080i has 1920x540 resolution...
OK. I'll stop now. Bowing out of the conversation.
Mike
Wow. My [OT] thread went even farther off-topic...
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