What is the difference between 480i, 480p, 720p, 1080i, and 1080p?
The "i" and "p" refer to interlaced or progressive scanned images as described above. 480i is considered "standard" definition television and is the image we have all enjoyed for well over half a century. With new digital technology this 480i image can result in a very respectable picture quality for the viewer.
Take a 480i image and show both fields simultaneously and you have 480p, or progressive. This is the native format encoded onto a DVD (Digital Versatile Disc). Both 480i and 480p are based upon the standard 525 line NTSC broadcast system.
720p is a progressive scan high-definition system supported by digital broadcast. A 720p system uses 720 horizontal scanning lines displayed in a progressive manner every 1/30 second.
1080i is a high-definition system supported by digital broadcast. A 1080i system uses 540 horizontal scanning lines displayed in two interlaced fields, each field displayed every 1/60-second.
1080p is a progressive scan high-definition system not currently available to consumers, although some interpolation devices can display 1080i and 720p source material in the 1080p format. 1080p shows 1080 horizontal scanning lines painted every 1/30-second.
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