What is High Definition Video?
High-definition video or HD video refers to any video system of higher resolution than standard-definition (SD) video, and most commonly involves display resolutions of 1280×720 pixels (720p) or 1920×1080 pixels (1080i/1080p). The difference between 1080i (interlacing) and 1080p (progressive) is in the way the signal is sent from a source component or displayed on an HDTV screen.
1080P is the best right now. 1080i interlaces the lines at 30 frames per second while 1080p is progressive at 60 frames per second. Interlacing means that the TV is producing the picture every other line, once it hits the bottom, it starts with the 2nd line and goes though each of the other lines, and it does this at 30hz(frame rate)
Progressive does each line by line. So it does every single line in a row at 60hz – So 1080P gives you the best picture. 1080P content you get from some video games and Blu-Ray movies. 1080i is the best you get from your cable or satellite service.
Most formats include:
Television broadcast (HDTV),
Video recording formats (HDCAM, HDCAM-SR, DVCPRO HD, D5 HD, XDCAM HD, HDV and AVCHD),
The optical disc delivery system Blu-ray Disc
Video tape format D-VHS.
There are Extra High-Definition video modes: 2k (2048×1536), 2160p (3840×2160), 4k (4096×3072), 2540p (4520×2540), and 4320p (7680×4320)
16:9 Widescreen Aspect Ratio
To add on to the High Definition explanation above, it will be important to know that all HD displays are in a 16:9 (Widescreen) Aspect Ratio. We have therefore purchased two 12/7 (foot) Fast-Fold screens, like in the picture above, to accommodate this.
Now, to not confuse too many people and to revert to our trusted metric system, the aperture (Image Size) is exactly 3.65m Wide x 2.13m High.