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720x405 Why?

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Marcus Remberger
720x405 Why?
on Feb 25, 2008 at 1:56:16 pm

Hi!

Does anyone know why 720x405 is the right aspect ratio for true 16:9?
I have a anamorphic video and in some frames a circle appear. When i convert these frames to 720x405 the circle becomes oval.
But when i convert to 720x432 the circle gets it right shape.
If you multiply (PAL) 576*0.75 you get 432. Doesn´t that sounds more correct?
I appreciate all comments and help!!


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Daniel Low
Re: 720x405 Why?
on Feb 25, 2008 at 7:37:32 pm

720x405 is 16:9 square pixel:

16/9 = 1.78 (1.7777777777778)

720/405 = 1.78

405x1.78 = 720.9

720/1.78 = 404.9

What or where is your source from?

Generally speaking, are you working in PAL or NTSC?

What are you delivering to?




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Marcus Remberger
Re: 720x405 Why?
on Feb 26, 2008 at 8:18:10 am

I´m working in PAL and delivering the video as hi-res QT.
Thanks for your help!


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Daniel Low
Re: 720x405 Why?
on Feb 26, 2008 at 10:39:49 am

Ok, but 720x405 is not a PAL resolution. Where did the clip(s) come from?


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Marcus Remberger
Re: 720x405 Why?
on Feb 26, 2008 at 10:48:25 am

The source video is PAL 720x576 anamorphic. The client want the files as widescreen. Thats why im asking.


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Daniel Low
Re: 720x405 Why?
on Feb 26, 2008 at 1:03:43 pm

Then you could give him 1024x576 square pixels, or 720x576 non-square or 720x405 square pixels.

It all depends on what your client wants to do with the material?


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Marcus Remberger
Re: 720x405 Why?
on Feb 26, 2008 at 1:23:05 pm

Its jusy for viewing so the can se the films how they appear on a widescreen TV.


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Daniel Low
Re: 720x405 Why?
on Feb 26, 2008 at 4:26:20 pm

For viewing on a (Widescreen) TV you should be delivering 720x576 non-square.


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