1080p and 1080i - High-Def Digest Forums
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Old 04-02-2008, 09:52 PM
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Default 1080p and 1080i

whats the difference?

my plasma plays 1080i and all my titles look great.

is 1080p just a grade higher then 1080i.

and is 1080i a grade higher then 720?
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Old 04-02-2008, 10:52 PM
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Originally Posted by bradyreichert View Post
whats the difference?

my plasma plays 1080i and all my titles look great.

is 1080p just a grade higher then 1080i.

and is 1080i a grade higher then 720?
Both 1080I and 1080P signals have the same amount of resolution 1920 X 1080 (over 2 million pixels). Progressive scan is better then interlace. BLU-RAY is the best looking consumer source on the market that offers 1080P/24 native movies. Broadcast, satellite, and cable HD programming are all 1080I and 720P. Every consumer HD service is at reduced quality and at lower bit rates compared to BLU-RAY. 720P is 1280 X 720P quality (one million pixels).


Here is the order of quality with 1080P being the highest.
  • 1080P HD
  • 1080I HD
  • 720P HD
  • 480P Standard Definition
  • 480I Standard Definition and also the native format of DVD movies.
Your Plasma most likely is a 720P model that accepts 1080I signals and down converts them to 720P quality.
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Old 04-02-2008, 11:15 PM
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Originally Posted by HDTV1080P View Post
Both 1080I and 1080P signals have the same amount of resolution 1920 X 1080 (over 2 million pixels). Progressive scan is better then interlace. BLU-RAY is the best looking consumer source on the market that offers 1080P/24 native movies. Broadcast, satellite, and cable HD programming are all 1080I and 720P. Every consumer HD service is at reduced quality and at lower bit rates compared to BLU-RAY. 720P is 1280 X 720P quality (one million pixels).


Here is the order of quality with 1080P being the highest.
  • 1080P HD
  • 1080I HD
  • 720P HD
  • 480P Standard Definition
  • 480I Standard Definition and also the native format of DVD movies.
Your Plasma most likely is a 720P model that accepts 1080I signals and down converts them to 720P quality.
Sorry, but that just sounded like a blu ray infomercial.
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Old 04-02-2008, 11:54 PM
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yea i dont know excatly where that came from!
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Old 04-03-2008, 01:43 AM
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how would you know if my plasma is only 720p?
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Old 04-03-2008, 02:49 PM
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Originally Posted by bradyreichert View Post
how would you know if my plasma is only 720p?
Flat panels come in 720P and 1080P. Flat panels are all progressive scan. Older CRT screens use 1080I at around 1380 X 1080. A flat panel LCD or Plasma will take a 1080I signal and either down convert it to 720P or de-interlace the signal and upconvert it to 1080P.
So far no one is broadcasting in 1080P yet and might not do so for several years. BLU-RAYís look much better then any 1080I satellite or cable 1080I signal that I have every seen.
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Old 04-03-2008, 05:27 PM
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I just dont like how you put 1080i above 720p. It really depends on what your watching. Thought thats why all sports are broadcast in 720p because motion is more fluid where 1080i has higher resolution so it looks better in more still situations.
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Old 04-04-2008, 01:43 PM
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Originally Posted by SLARITY View Post
I just dont like how you put 1080i above 720p. It really depends on what your watching. Thought thats why all sports are broadcast in 720p because motion is more fluid where 1080i has higher resolution so it looks better in more still situations.
1080 interlace has more resolution then 720P and for old discountined formats like D-VHS the studios decided to release all movies in 1080I including fast action movies. Yes some people prefer 720P over 1080I when it comes to sports since progressive is better for fast moving motion. Now with 1080P one can have the best of both formats when watching future BLU-RAY sports discs. Perhaps someday Verizon FIOS will offer sports in 1080P since they have plenty of bandwidth to do so.
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Old 04-04-2008, 02:35 PM
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Originally Posted by HDTV1080P View Post
1080 interlace has more resolution then 720P and for old discountined formats like D-VHS the studios decided to release all movies in 1080I including fast action movies. Yes some people prefer 720P over 1080I when it comes to sports since progressive is better for fast moving motion. Now with 1080P one can have the best of both formats when watching future BLU-RAY sports discs. Perhaps someday Verizon FIOS will offer sports in 1080P since they have plenty of bandwidth to do so.
My tv is a 50" 720p. I keep my inputs (cable box & PS3) set to 1080i. When watching sports, should I switch the cable box to 720p? I know my tv will only give me 720p anyway, so is there any difference?
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Old 04-04-2008, 05:20 PM
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Originally Posted by STR8UP&DOWN View Post
My tv is a 50" 720p. I keep my inputs (cable box & PS3) set to 1080i. When watching sports, should I switch the cable box to 720p? I know my tv will only give me 720p anyway, so is there any difference?
There might be a native setting on your cable box that allows the box to output 720P for 720P programs and 1080I for 1080I programs. Some sports are broadcast in 1080I while others are 720P (depends on the station).
If the cable channels you are watching are 720P then your cable box should be set for 720P (or native if there is a native option). If the cable channel you are watching is 1080I then either your cable box or TV needs to downconvert it to 720P. It all depends on which device has the better down convert when it comes to which well give you the best picture. Most TVís have a info button on them or another type of option that brings up a small menu that tells you if the signal being received is 1920 X 1080 or 1280 X 720P, etc.
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