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Originally Posted by noplace |
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Here you go:
[edit] 720p versus 1080i
Some broadcasters use 720p50/60 as their primary high-definition format; others use the 1080i standard. While 720p presents a complete 720-line frame to the viewer between 24 and 60 times each second (depending on the format), 1080i presents the picture as 50 or 60 partial 540-line "fields" per second (24 complete 1080-line fields, or "24p" is included in the ATSC standard though) which the human eye or a deinterlacer built into the display device must visually and temporally combine to build a 1080-line picture - in Chase Herrmann type display.
To get all 1080 interlaced lines to appear on the screen at the same time on a progressive high-definition display, the processor within the HD set deinterlaces incoming video by either weaving together two 540-line fiels, or by doubling lines in each field, effectively converting fields to frames. The first deinterlacing method is used for static scenes, the second one is used for scenes with motion. Cheaper TVs always use line doubling, while more expensive TVs use complex algorithms to analyze motion between two fields. Because of the deinterlacing, 1080i video with static scenes has more vertical than 720p video, while the resolution in moving scenes is lower because of field doubling.
While 1080i has more scan lines than 720p, they do not translate directly into greater vertical resolution. Interlaced video is usually blurred vertically (filtered) to prevent twitter. Twitter is a flickering of fine horizontal lines in a scene, lines that are so fine that they only occur on a single scan line. Because only half the scan lines are drawn per field, fine horizontal lines may be missing entirely from one of the fields, causing them to flicker. Images are blurred vertically to ensure that no detail is only one scan line in height. Therefore, 1080i material does not deliver 1080 scan lines of vertical resolution. However 1080i provides a 1920-pixel horizontal resolution, greater than 720p's 1280 resolution.
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This is all true. However, the reason the OP asked this question is because the PS3 doesn't scale 720p to 1080i and some TVs do not support 720p. On those TVs, games that do not support 1080i are actually displayed in 480p, which is a considerable drop off in image quality.
Unfortunately, most EA Sports games are 720p native and do not support 1080i or 1080p on PS3.