[mythtv-users] [OT] *Real* High-Def TV!

[Michael T. Dean]

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...