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pixel aspect ration from HD to SD

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Anhtu Vu
pixel aspect ration from HD to SD
on Apr 20, 2013 at 4:32:40 pm

I just want to wrap my head around the aspect ratio and pixel size. I need to output an SD mov and my footages are SD and HD. If i want to retain the proper proportion of my HD footage, i must choose the NTSC DV vs NTSC DV widescreen, right ??? I assume this is because NTSC DV pixel aspect is .91 (which is closer to HD pixel aspect of 1.0) vs 1.21 for widescreen...correct ??? Thx



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Darby Edelen
Re: pixel aspect ration from HD to SD
on Apr 20, 2013 at 7:10:05 pm

This depends on whether you're converting the HD footage to SD widescreen or 4:3 SD letterboxed. Pick whichever comp preset is accurate for the delivery (widescreen if delivering for widescreen).

Darby Edelen


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Anhtu Vu
Re: pixel aspect ration from HD to SD
on Apr 20, 2013 at 10:34:18 pm

since HD is 16:9 i assume NTSC Widescreen is the correct setting, but with this setting the footage looked stretched vertically. When i changed the comp to NTSC DV, i have the proper letter box image of my HD.

So my question is, when i change the HD to SD widescreen, why does it look stretched ?? Aren't both 16:9 proportion ?? Does this have anything to do with pixel aspect .09 vs 1.21 ???



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John Cuevas
Re: pixel aspect ration from HD to SD
on Apr 21, 2013 at 2:44:13 pm

Change your comp to the DV Widescreen preset(Cntl+K), then under the comp window you will see two arrows pointing left/right, Pixel Aspect Ratio Correction(PAR), press that and your footage should look correct.

Johnny Cuevas, Editor
Thinkck.com

"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.


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John Cuevas
Re: pixel aspect ration from HD to SD
on Apr 21, 2013 at 2:53:22 pm

Adobe Help: Pixel aspect ratio and frame aspect ratio

Johnny Cuevas, Editor
Thinkck.com

"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.


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