Re: 16x9 project questions

[Andi Loor <andiloor(at)algonet.se>]

Jef,
the 16/9 image is squeezed onto 4/3 pixels. In the old days this kind of 
anamorphic squeeze was done with a special lens doing the squeesing on 
the film camera and another lens on the projector to unsqueese in the 
cinema theater. Today this is done electronically inside the camera 
before it actually reaches the tape.
The way the squeese looks can simply be viewed at by watching a 16/9 
image on a monitor with 4/3 setting. This is how the image is kept on 
the tape.
So my answer is 1 and 2: the image is squeesed before it reaches the 
tape, kept as 720x480 pixels for ever after and scaled for viewing 
purpouses, plus as I and Bob said in the earlier mails, DS has to know 
that it is actually working with the squeesed image for a lot of 
different actions. For example DS needs to know this to get the graphic 
texts right when you add them in your project.
Questions?
Andi

Jef Huey wrote:

> Hi Andi,
>
> Ok, so the way I read you response (thanks by the way) it could be 
> interperted two ways.
>
> 1.   The pixels are scaled on capture and again on output.  Since on 
> tape there is no difference between a 16x9 pixel and a 4x3 pixel.
>
> or
>
> 2.   Pixel scaling is only inside the DS for viewing purposes.   I 
> would lean towards this since the broadcast monitor is representing 
> what will go to tape.
>
> Is 2 more to your understanding?
>
> Jef
>
>
>
>
> Andi Loor wrote:
>
> > Hi Jef,
> > It is a matter of pixel size. The 16/9 pixels differ from the 4/3 
> > pixels in that they are wider. There is the same amount of pixels but 
> > since the 16/9 pixels are wider the image becomes wider. Actually the 
> > 16/9 recording to tape is performed with a sqeeze of the image onto 
> > the same amount and width pixels as during 4/3 recording and during 
> > playback they are stretched to allow the image to look normal. When 
> > working with 4/3 or 16/9 settings in DS the viewing area is adjusted 
> > to show wider/stretched pixels or normal/non stretched pixels. There 
> > is also metadata written with the clip so that DS will know how the 
> > image originally was captured. Hope this clears some of your questions
> > Andi
> >
> >
> > Jef Huey wrote:
> >
> > > I have been experimenting with DSs SD 16x9 versus 4x3 project 
> > > settings.  I am trying to understand what is happening "under the 
> > > hood".
> > >
> > > Since on tape, a digibeta ONLY records 720x486 pixels, I am making 
> > > my first assumption that DS is also doing the same.  IE, that 
> > > whether or not you choose 4x3 or 16x9, there are only 720x486 pixels 
> > > captured.  Is this true?
> > >
> > > Beyond that, what is different between the two project setups.  In a 
> > > 16x9 project, I can see that in the viewing monitors on the 
> > > workstation output that the image is a correct 16x9 (not 
> > > anamorphic).  Fine.  What about generated text?  Is the aspect ratio 
> > > been correct when I generate new text?  What happens when I bring in 
> > > a graphics  effect from a 4x3 to a 16x9 project?
> > >
> > > I imported some footage from a 4x3 into this test 16x9 project and 
> > > DS seemed to scale it.  What rules are used?  What Scaling method?  
> > > Can I change the default if I need to (I already know the answer to 
> > > that, just bringing it up).  And what happens in the opposite 
> > > direction (16x9 to 4x3)?
> > >
> > > Is there any doc on this?  I did a search in the on board help in DS 
> > > and found nothing.  Did I look in the wrong place?
> > >
> > > So many questions.  This is something that I would hope would be 
> > > covered in detail in documentation.
> > >
> > > Thanks for reading.
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--
Andi Loor
www.andiloor.se

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