Does HDV = 4:2:2 SD? at DVinfo.net

John Poore · April 9th, 2006, 03:51 AM

Does HDV = 4:2:2 SD?
I've seen various technical discussions on this which go right over my head, but I want to know, if I downconvert 1080i HDV to a 4:2:2 SD codec like DVcPro 50 or Canopus, will I get full 4:2:2 colour from th FX1 in standard def?

Mark Grant · April 9th, 2006, 06:48 AM

Pretty much: effectively HDV stores the color information for a group of four pixels, and when you scale down to SD from 1080i you're cutting the pixel count by about 75%. So absent compression issues, you'll actually have more color information than shooting native 4:2:2 SD; a smart scaler could probably use the extra luminance information to give you ten-bit video as well.

Leo Pepingco · April 9th, 2006, 07:27 AM

The next question is, would the same apply to an FX1 or Z1 shooting in DV mode?

Or is it the ability to just pull more info out of a HDV image?

John Poore · April 9th, 2006, 09:19 AM

Thanks for the reply Mark. I thought it was something like that given the amount of info on 1080i. Some of the tech discussion are v complicated.

Mark Grant · April 10th, 2006, 04:40 AM

Quote:

The next question is, would the same apply to an FX1 or Z1 shooting in DV mode?

No. DV25 is always 4:1:1 or 4:2:0.

April 9th, 2006, 03:51 AM	#1
John Poore Regular Crew Join Date: Nov 2004 Location: Johannesburg Posts: 107	Does HDV = 4:2:2 SD? Does HDV = 4:2:2 SD? I've seen various technical discussions on this which go right over my head, but I want to know, if I downconvert 1080i HDV to a 4:2:2 SD codec like DVcPro 50 or Canopus, will I get full 4:2:2 colour from th FX1 in standard def?

April 9th, 2006, 06:48 AM	#2
Mark Grant Regular Crew Join Date: Oct 2004 Location: Saskatoon, Canada (was London, UK) Posts: 138	Pretty much: effectively HDV stores the color information for a group of four pixels, and when you scale down to SD from 1080i you're cutting the pixel count by about 75%. So absent compression issues, you'll actually have more color information than shooting native 4:2:2 SD; a smart scaler could probably use the extra luminance information to give you ten-bit video as well.

April 9th, 2006, 07:27 AM	#3
Leo Pepingco Major Player Join Date: Jan 2006 Location: Sydney, Australia Posts: 275	The next question is, would the same apply to an FX1 or Z1 shooting in DV mode? Or is it the ability to just pull more info out of a HDV image?

April 9th, 2006, 09:19 AM	#4
John Poore Regular Crew Join Date: Nov 2004 Location: Johannesburg Posts: 107	Thanks for the reply Mark. I thought it was something like that given the amount of info on 1080i. Some of the tech discussion are v complicated.