RGB or YUV at DVinfo.net

Go Back   DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic P2HD / DVCPRO HD Camcorders

Panasonic P2HD / DVCPRO HD Camcorders
All AG-HPX and AJ-PX Series camcorders and P2 / P2HD hardware.


Reply
 
Thread Tools Search this Thread
Old March 16th, 2006, 06:26 PM   #1
Regular Crew
 
Join Date: Mar 2005
Location: St.Louis, USA
Posts: 145
RGB or YUV

I have a question on dvcprohd format on HVX200.

Does HVX200 record in 4:2:2 RGB or converts to YUV and records it on the P2 card?

I read a article on about the color spacing and sony HDC-F950 4:4:4 RGB.

What is the difference between dvcprohd and HD? If there is a thread already on this question can somebody refer it here.
Harikrishnan Ponnurangam is offline   Reply With Quote
Old March 16th, 2006, 07:08 PM   #2
RED Problem Solver
 
Join Date: Sep 2003
Location: Ottawa, Canada
Posts: 1,365
In RGB, each pixel has an R, a G and a B value. This makes for an awful lot of data.

In component video, RGB is tranformed to Y'CbCr, where Y is luma, and Cb and Cr are two chroma difference components. This is often called YUV, but that is wrong. It's really Y'CbCr.

When in Y'CbCr you can reduce the resolution of the chroma without effecting the appearance of the video too much, hence 4:2:2 meaning that Cb and Cr are half the horizontal resolution of the luma.

That means, in DVCproHD, for each two record pixels of luma, there is just one pixel of Cb and one of Cr.

4:4:4 means that for each pixel, there is each component recorded. 4:4:4 can be RGB, and RGB must be 4:4:4 by definition. You can also get 4:4:4 Y'CbCr, but that's not too common.

Graeme
Graeme Nattress is offline   Reply With Quote
Old March 16th, 2006, 09:16 PM   #3
Regular Crew
 
Join Date: Mar 2005
Location: St.Louis, USA
Posts: 145
You mean a change in Luma will be very sensitive to the human eye or in other terms there will be a drastic change in the quality of video?

So obviously dvcproHD is not recording in RGB values it records in Y'CbCr 4:2:2

Makes a lot of sense.
Harikrishnan Ponnurangam is offline   Reply With Quote
Old March 16th, 2006, 09:20 PM   #4
RED Problem Solver
 
Join Date: Sep 2003
Location: Ottawa, Canada
Posts: 1,365
Most video formats record Y'CbCr. I think one of the that can do RGB is HDCAM SR.

DVCproHD is indeed using 4:2:2 Y'CbCr.

You're right about the human eye being more sensitive to luma than chroma!

Graeme
Graeme Nattress is offline   Reply With Quote
Old March 20th, 2006, 01:27 PM   #5
Regular Crew
 
Join Date: Mar 2005
Location: St.Louis, USA
Posts: 145
Just want to say RGB recording rocks. You can do whatever you want with a RGB image. I got a frame of RGB image and tried to color correct it in Adobe photoshop. Wow i can do so many things with that image. I want a F950.
Harikrishnan Ponnurangam is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic P2HD / DVCPRO HD Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 07:22 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network