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.
--
Andi Loor
www.andiloor.se
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