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The 0.9 DV Pixel Ratio and 720x534 Pics

Last response: in Graphics & Displays
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November 25, 2004 7:20:10 AM

Archived from groups: rec.video.desktop (More info?)

I have read here that you should use pic of 720x534 for import into
Premiere DV projects, since the pixel ratio is 0.9

BUT in my calculations, the pixel ratio is actually 0.88888
(repeating). I have read that the 0.9 ratio takes the 720x480 frame
size with it's ratio of 3:2, and squashes the width so it can display
it as a 4:3 aspect ratio.

But if you use 0.9, you end up with a relative viewing size of 648x480
which is not 4:3. But if you use 0.88888 you end up with 640x480
(exactly 4:3). I am thinking thbat they must have simply rounded the
actual ratio to 0.9 for simplicity.

Now - if you use 0.8888 as the ratio, then the imported images should
be 540, not 534.
Anonymous
November 25, 2004 6:37:01 PM

Archived from groups: rec.video.desktop (More info?)

Ken wrote:

> I have read here that you should use pic of 720x534 for import into
> Premiere DV projects, since the pixel ratio is 0.9
>
> BUT in my calculations, the pixel ratio is actually 0.88888
> (repeating). [...] then the imported images should
> be 540, not 534.

You might want to take a look at

<http://www.iki.fi/znark/video/conversion/&gt;

as well.

--
znark
Anonymous
November 25, 2004 7:28:35 PM

Archived from groups: rec.video.desktop (More info?)

534 works. Try it yourself by creating a large square and a large circle.
They will be right when projected at this.

Sincerely,
Carey Robson


"Ken" <ken.roberts@adelphia.net> wrote in message
news:nu5bq0dh6nge73d2sas2ev1kfbr1fuuish@4ax.com...
> I have read here that you should use pic of 720x534 for import into
> Premiere DV projects, since the pixel ratio is 0.9
>
> BUT in my calculations, the pixel ratio is actually 0.88888
> (repeating). I have read that the 0.9 ratio takes the 720x480 frame
> size with it's ratio of 3:2, and squashes the width so it can display
> it as a 4:3 aspect ratio.
>
> But if you use 0.9, you end up with a relative viewing size of 648x480
> which is not 4:3. But if you use 0.88888 you end up with 640x480
> (exactly 4:3). I am thinking thbat they must have simply rounded the
> actual ratio to 0.9 for simplicity.
>
> Now - if you use 0.8888 as the ratio, then the imported images should
> be 540, not 534.
!