1080p discs on 1080i tv

vloothuis

Standard Member
:blush:
Sorry to post as this is my knowledge not being up to scratch. I have checked and searched but cant find the answer to my question.

Whilst looking at the HD-DVD players and Discs, all the discs I saw display 1080p. (Except for many extras)

As my TV is only capable of up to 1080i will they display as 1080i or will the HD player/TV downscale the image to 720 or 480 perhaps?
 

kingfats

Distinguished Member
:blush:
Sorry to post as this is my knowledge not being up to scratch. I have checked and searched but cant find the answer to my question.

Whilst looking at the HD-DVD players and Discs, all the discs I saw display 1080p. (Except for many extras)

As my TV is only capable of up to 1080i will they display as 1080i or will the HD player/TV downscale the image to 720 or 480 perhaps?

Yes they will be displayed at 1080i
 

Avi

Distinguished Member
:blush:
Sorry to post as this is my knowledge not being up to scratch. I have checked and searched but cant find the answer to my question.

Whilst looking at the HD-DVD players and Discs, all the discs I saw display 1080p. (Except for many extras)

As my TV is only capable of up to 1080i will they display as 1080i or will the HD player/TV downscale the image to 720 or 480 perhaps?

1080i is a signal type and the resolution shown by your display will depend on its native pixel resolution. For example if your display has a native pixel res of 1920x1080 then this will match 1080i resolution. However, if your display is 1280x720 native pixel res then it will downscale the 1080i signal and show it at this lower res.

Many displays will accept a 1080i signal but are not capable of displaying the full 1920x1080 resolution. :)

AVI
 

kingfats

Distinguished Member
1080i is a signal type and the resolution shown by your display will depend on its native pixel resolution. For example if your display has a native pixel res of 1920x1080 then this will match 1080i resolution. However, if your display is 1280x720 native pixel res then it will downscale the 1080i signal and show it at this lower res.

Many displays will accept a 1080i signal but are not capable of displaying the full 1920x1080 resolution. :)

AVI

Hi i thought 1280x720 pixel was enough to show full 1080i.Tell me if i'm wrong!
 

Avi

Distinguished Member
Hi i thought 1280x720 pixel was enough to show full 1080i.Tell me if i'm wrong!

You're wrong :) With HD DVD and BD the image is encoded on the disc at a res of 1920x1080 in 24 progressive frames per second. With these formats a 1080i image signal is simply each 1920x1080 progressive frame split into two fields. Each field is then transmitted to the display and reassembled into an identical to the original 1920x1080 progressive frame (assuming your display is 1920x1080 native res).

With HD DVD 1080p and 1080i are the same 1920x1080 resolution it's just how they are transimtted to the display that's different. With high quality video processing (very important) in the display there is no perceived difference between these two signal types.

A 1280x720 display is using less than half of the real image data available in a HD DVD or BD 1080i signal.

AVI
 

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