What resolution to use for a 16:9 Widescreen AMV?

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*Tuna Universe
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What resolution to use for a 16:9 Widescreen AMV?

Post by *Tuna Universe » Sun Apr 17, 2005 6:18 pm

Hey everyone,

Okay, I have a question about resolution.

From reading the guides, the resolution settings when creating a project in adobe premiere should be 720x480.

Why is it 720x480 and not 640x480?

640x480 is 4:3 and even video files like fansubs are 640x480 and they fit your computer monitor when played in full screen. So why do you set the resolution in project settings of adobe premiere to 720x480?

I don't really understand that. I hope someone can help me out with that.

Okay, now for the real question.
If I wanted to make a widescreen 16:9 AMV, then what would I put for the resolution?

I was messing with the calculator and multiplied both 16 and 9 by 40.

I got 640x360. That is 16:9 isn't it?
Is that how you come up with a widescreen size for an AMV?

This is the thing... When you make a 4:3 amv you set it to 720x480 instead of 640x480.
So what I'm wondering is do you have to set it to 720x360 instead of 640x360?

I am very confused! Someone help me out
:?

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Post by trythil » Sun Apr 17, 2005 6:24 pm

http://www.mir.com/DMG/aspect.html
http://www.uwasa.fi/~f76998/video/conversion/

In particular, this all comes down to pixel aspect ratio, i.e. the aspect ratio of a single pixel. Reading those two webpages, the Guides (again), and keeping PAR in mind should tell you what's going on.

The resize calculator (included in the Guides) is a good way to see all of this working in real-time.

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Re: What resolution to use for a 16:9 Widescreen AMV?

Post by Scintilla » Sun Apr 17, 2005 6:36 pm

*Tuna Universe wrote:From reading the guides, the resolution settings when creating a project in adobe premiere should be 720x480.

Why is it 720x480 and not 640x480?

640x480 is 4:3 and even video files like fansubs are 640x480 and they fit your computer monitor when played in full screen. So why do you set the resolution in project settings of adobe premiere to 720x480?

I don't really understand that. I hope someone can help me out with that.
Because video is stored on (NTSC) DVDs at that resolution, 720x480.

Yet it plays back 4:3 on TVs (unless it's anamorphic).

Why? Because <i>TV pixels are not square</i> like computer monitor pixels are.

You <i>can</i> change your footage to 640x480 before editing if you want, and in fact that's what I'm doing right now for my current project because I expect a lot of image work and I don't feel like resizing all my images to 9/8 the original width.
And you certainly <i>should</i> resize your video to a 4:3 aspect ratio for online distribution.
*Tuna Universe wrote:Okay, now for the real question.
If I wanted to make a widescreen 16:9 AMV, then what would I put for the resolution?

I was messing with the calculator and multiplied both 16 and 9 by 40.

I got 640x360. That is 16:9 isn't it?
Is that how you come up with a widescreen size for an AMV?
Normally, that would work. However, 360 isn't a multiple of 16 (important to make some codecs work right). So you'd make the height 352.

And remember, <i>never vertically resize interlaced footage</i>. Remove all the combing first, or it's gonna be really hard to take care of later (because changing the height will blend the scanlines together).
*Tuna Universe wrote:This is the thing... When you make a 4:3 amv you set it to 720x480 instead of 640x480.
So what I'm wondering is do you have to set it to 720x360 instead of 640x360?
It depends on whether your source is anamorphic or letterboxed.

If it's anamorphic, then 720x352 would work (don't have to change the width); I personally prefer 960x480 (or, for square pixels, 848x480) (don't have to change the height).

If it's letterboxed, then you can leave it as 720x480, or crop off the letterboxing and make it 720x352 that way. Or resize it to 640x480, or crop <i>and</i> resize to 640x352... there's quite a few options.
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Post by *Tuna Universe » Sun Apr 17, 2005 7:02 pm

Normally, that would work. However, 360 isn't a multiple of 16 (important to make some codecs work right). So you'd make the height 352.

And remember, never vertically resize interlaced footage. Remove all the combing first, or it's gonna be really hard to take care of later (because changing the height will blend the scanlines together).
Oh! Okay, so just try to keep it as a multiple of 16.
Thanks!

Oh and about the 640x480 vs 720x480 thing.
Pretty much keep it 640x480 for online distribution and resize it to 720x480 for TV or conventions right?

Thanks alot scintilla.

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Post by trythil » Sun Apr 17, 2005 7:15 pm

[quote="*Tuna Universe"
Oh and about the 640x480 vs 720x480 thing.
Pretty much keep it 640x480 for online distribution and resize it to 720x480 for TV or conventions right?
[/quote]

No, you don't have to stay at 640x480 for online distribution. In fact, it's better if you don't, because otherwise, you'll have to resort to letterboxing to maintain the proper aspect ratio. Unless you do this properly (i.e. align the black such that the border between it and actual picture occurs on a scanline x such that x mod 8 equals zero), you'll have a less than optimal encode.

In short, 640x480 works well for 4:3 material, but less so for anamorphic material.

Use the resize calculator to help you figure out good resolutions to resize to.

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