So what do these numbers mean?
And what does the letter at the end mean?
Those questions spurred on my newest google (re)search.
Answers:
P stands for progressive scan - shows full picture at one time
I stands for interlaced scan - takes two passes to get all picture
The number refers to number of lines in image.
More lines means clearer picture, more realistic.
Links to articles:
High Definition Television Info
HDTV Showdown: 1080i and 720p
Wikipedia: 1080i, 720p, 1080p, HDTV
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