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General HD (720 / 1080) Acquisition
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Old June 26th, 2007, 12:19 PM   #1
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1440x1080 or 1920x1080

Hi,

Please correct me if I'm wrong.
I understand that HDV cams scan at 1440 x 1080 then stretch the image to 1920x1080, correct?
So does this mean that I don't really have to buy a 1920 x 1080 monitor? I can use a 1440 x 1080 to view the full rez of any HDV cams?

I appreciate your help
larry
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Old June 26th, 2007, 01:57 PM   #2
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Not really.

HDV uses non-square pixels... the pixels are rectangular.

2- Computer monitors do square pixels; you should get a 1920x1080 monitor (1920x1200 since computer monitors don't come in 1920x1080).
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Old June 26th, 2007, 03:46 PM   #3
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There's no stretch involved when going from 1440HDV for 1920HD.
1440HDV uses pixels with ratio 1.33, while 1920HD uses square pixels.
1440 * 1.33 = 1915.
The 1.33 aspect HDV naturally fills square pixels in 1920HD.

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Originally Posted by Larry Secrest View Post
I understand that HDV cams scan at 1440 x 1080 then stretch the image to 1920x1080, correct?
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Old June 29th, 2007, 06:05 PM   #4
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OK, so can I monitor what's out of a HV20 if I have a 1680 x 1050 monitor or it's an unacceptable compromise for somebody editing narratives? What would be my problems, other than not seeing the full rez?
Larry
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Old July 1st, 2007, 12:06 PM   #5
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You're fine viewing high definition video on a 1680 x 1050 monitor. It's not native HD, but it's close. You should see nice pictures. Two questions... does this monitor have HDMI inputs, and do you plan to view the live output of the HV20? If you view the taped video, it's actually 1440 x 1080 (HDV standard).
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Old July 1st, 2007, 12:27 PM   #6
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Quote:
Originally Posted by Maksim Yankovskiy View Post
There's no stretch involved when going from 1440HDV for 1920HD.
1440HDV uses pixels with ratio 1.33, while 1920HD uses square pixels.
1440 * 1.33 = 1915.
The 1.33 aspect HDV naturally fills square pixels in 1920HD.
Right. The "stretch" is actually the HDV standard to get an HD picture with less data required. This process is called anamorphic and has been around for awhile. By using rectangular pixels with a 1.333:1 ratio, the HDV standard allows for an image visually the same width as native 1920 but recorded with fewer actual pixels and thus reducing the amount of data required.
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Old July 1st, 2007, 01:49 PM   #7
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Calling it a "stretch" is inaccurate because it implies that something is being done to the width of the image, which is not what's happening at all. It's better described as a scaling process, and it happens automatically with any HDTV. The image is still the same width, it's just changed from 1440 anamorphic to 1920 square.
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Old July 2nd, 2007, 07:43 PM   #8
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i think the answer to your question is a clear resounding yes!

Quote:
Originally Posted by Larry Secrest View Post
Hi,

Please correct me if I'm wrong.
I understand that HDV cams scan at 1440 x 1080 then stretch the image to 1920x1080, correct?
So does this mean that I don't really have to buy a 1920 x 1080 monitor? I can use a 1440 x 1080 to view the full rez of any HDV cams?

I appreciate your help
larry
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