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16:9 = 1.77 or 1.89


16:9 = 1.77 or 1.89 - "Perry"


Tom Guiking posted:
>I measured the image of the 16:9 setting on my TRV-900 and it appeared that
is was not 16:9 = 1.7777. It was more or less 1.89. Not a huge difference
but still about a 7% deviation in the horizontal part. So what should I take
as a safe area? I suspect that top and bottom are OK, so probably I have to
take in account that not everything at the far left and/or right will be
visible on wide screen?<
This is suspicious since the ratio of 1.89:1.77 is the same as 768:720 which
is the amount that PAL DV is nominally out of square (pixels wise).
In fact the active area of a PAL image is about 702 pixels wide, and for
most consumer cameras the manufacturer blanks off the rest of the frame
width. This active area should represent the true 4:3 or 16:9 aspect ratio.
As to his other question, it depends on what you use for expanding the
vertical size in post. I would find it difficult to accept that any real
time interpolation in the camera can better the results of After Effects on
its best setting. I have not seen the Canon but I can confirm that the Sony
VX2000 in it's various forms does a good mangling job as you can see from
looking at:
http://www.btinternet.com/~perrybits/Widetest.jpg
Perry Mitchell
Video Consultant
http://www.perrybits.co.uk




(diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-)


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