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Posted by Ken Maltby on 08/20/06 05:21
<mmaker@my-deja.com> wrote in message
news:1156032789.124029.107350@p79g2000cwp.googlegroups.com...
> Martin Heffels wrote:
>> The amount of pixels will depend on the camera you have.
>
> No it won't. If it's 1080i HDV it's 1440x1080, period. The camera is
> irrelevant, except to the extent that the CCDs in cheaper cameras may
> be unable to provide the full resolution to record.
>
>> > pixels with 720x540
>> >color values. Scale that down to SD NTSC or PAL and you have
>> >approximately one color value and 10 bits of luminance data per pixel.
>> Say what? When you scale up,
>
> Who is talking about scaling up here? What's so hard to understand
> about _SCALING DOWN_ from HD to SD? You do understand that high
> definition is higher resolution than standard definition, right? Hence
> the 'high definition' in the name?
>
> This is really very, very simple maths: I don't understand why you're
> having such a problem with it.
>
> Mark
>
Scaling down from HD to SD can allow for full main profile with
its normal color space, which is quite good. But- as Martin
mentioned it can't make up additional color space data that was not
in the original, except by interpolation. On some level this will even
work, a little, in terms of some potential for the image, where you are
using a process that can benefit from 4:4:4.
The practical question is still "Is the camera able to output SD with
full data?" I don't see any reason an HDV camera would have any
problem doing so. It is using the same chips to capture the data, it's
just a matter of how much of the data it uses and how it is packaging
the results.
Luck;
Ken
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