480i,720i,1080i

[VIAN]

Anyone know the mystery behind the i.

 

[MercenaryForHire]

Interlaced vs Progressive. There's no such thing as 720i, IIRC - there is 720p though.

- M4H

 

[1ManArmY]

720 progressive = High Definiton

 

[rbV5]

I = interlaced, and 720i doesn't belong in the group(normally). 720p is the appropriate resolution in the progression, and p= progressive. They refer to the way the screen is drawn. With interlaced display, 2 fields are "laced" together to draw the screen, each "field" is composed of every other scanline and each field is displayed every 1/60th of a second (for 60hz) To create each frame every 1/60th of a second (60fps) Progressive scanned means that each frame is drawn completely (every scanline)

edit: corrected

 

[Tab]

Whats the difference between all of them? More pixels or what :|

 

[stevennoland]

Tabb, 480i is 480 line of resolution with interlasing (240 lines drawn then the other 240 lines drawn). 702p or progressive means all 720 lines are drawn at once. 1080i is like 480i in that it is interlaced (540 lines drawn then the other 540). 1080i may give you more lines but they are interlaced. I have a Samsung DLP 50" rear projection tv and it is capable of all the formats. The best I can get is 1080i from a high-def source (eg. Cable, satellite, or local HD broadcasts). In home the best I can get is 480p off my DVD player using composite video. I hear Samsung just released a new DVD player that up-converts 480p to 720p using the DVI interface. These players a going for around $300.00 . I have yet to see the difference, but I hear it's pretty good.

 

[VIAN]

Thats what I thought, thanx.

 

[rbV5]

Whats the difference between all of them? More pixels or what

They just represent a resolution and framerate:

480i = 320x240 x2 every 1/30 second
480p = 640x480 x1 every 1/60th second
720p = 1280 x 720 x1 every 1/60th second
1080i = 1920 x 540 x2 every 1/30 sec
1080p/24/30/60 = 1920 x 1080 x1 every 24/30 or 60 fps.