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Panasonic and 1080i or 720P


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#1 mathew bettow

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Posted 05 May 2008 - 03:42 PM

I'm always going to shoot at 59.94 but what are the factors that guide me in choosing 1080i or 720P with the HDX900? Final output is almost always either SD to DVD or the web.
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#2 Mitch Gross

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Posted 05 May 2008 - 10:01 PM

Then it will make no difference.
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#3 mathew bettow

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Posted 06 May 2008 - 10:52 AM

Then it will make no difference.



Mitch, when does it make a difference?
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#4 John Holland

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Posted 06 May 2008 - 11:01 AM

Well when its going to been seen in a HD mode not on SD ,Youtube etc.
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#5 John Sprung

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Posted 06 May 2008 - 12:37 PM

Final output is almost always either SD to DVD or the web.

For those outputs, it's not particularly important. If you don't know what you may need to upconvert to, the best choice would be 720p.

In the case of your camera, the HDX-900, 1280 x 720 is the native photosite grid of the chips. The 720p output, therefore, has the least amount of in-camera processing. To make 1080i, it has to downconvert 720 lines to 540 lines in two different ways to make the interlaced fields.

In general, you're better off progressive than interlaced, because you don't have interlace artifacts, and you don't have to roll off resolution to prevent interline flicker. The vertical resolution of an interlaced system is typically limited to about 0.65 times the vertical resolution of a progressive system with the same number of lines. Interlace is also harder to compress digitally.

It's better to have equal horizontal and vertical resolution -- "square pixels" -- because the human visual system sees a picture with mismatched resolution as having the lower of the two resolutions (for a ratio of resolutions up to about 2:1 -- more than that, and people see that the tops and bottoms are either sharper or softer than the sides.)

Interlace was a good solution to a bandwidth problem in analog broadcasting to CRT TV sets.



-- J.S.
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