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0:4:4 Chroma in setup menu

6 replies [Last post]
Bill D
User offline. Last seen 9 years 50 weeks ago. Offline
Joined: 18 Aug 2005

He, I was just wondering on a Kalypso in the eng setup, source definition menu?. What is the 0:4:4 chroma selection used for? Is this useful for when you have a DDR that uses a chroma key rather than a key signal? If so how does it work when you key the sources? can you set a certain default color to use, etc.
thanks
Bill

Bill D
User offline. Last seen 9 years 50 weeks ago. Offline
Joined: 18 Aug 2005
[quote="Bob Ennis"]The answer to all of your questions is yes - you can use macros to activate chroma keys and to type in values, and to assign partitioning.[/quote] Cool, love the multiple ways to do any task thanks Bob
Bob Ennis
User offline. Last seen 4 years 32 weeks ago. Offline
Joined: 24 Aug 2005
The answer to all of your questions is yes - you can use macros to activate chroma keys and to type in values, and to assign partitioning.

Bob Ennis

Bill D
User offline. Last seen 9 years 50 weeks ago. Offline
Joined: 18 Aug 2005
[quote="Bob Ennis"]On the Standard-Def Kalypso, the 0:4:4 selection was designed to take dvantage of a optional box that GV offered (and may sill offer). This box took RGB & converted it to a black & white signal derived soley from the chromanance of the RGB (Thus the :4:4 portion of the 0:4:4 signal). This became the hole-cutter for the chroma key. In some of my classes & demos, I showed this feature - even the so-called "experts" really couldn't see a big difference between the 0:4:4 & the standard 4:2:2 chroma key (it was easy to fool pretty much everyone who saw it as to which mode was which). I understand that few of these conversion boxes were actually sold. On the HD Kalypso, this is a moot point...the choice isn't even in the menu anymore.[/quote] Good info Bob, when we moved to our new facility years ago ('97) we were moving from a 3K to 4K. Interesting enough someone had purchased 2 analog chroma keyer cards (4 inputs I think). No one ever wired the RBG's from the camera's to those inputs. A few years we tried patching RGB's from a camera to those inputs and we got terrible results, sure we did something wrong, we were curious if you could even notice a difference. On another topic kind of related, for those that use chroma key with their DDR instead of a keysignal, is there a way to make sure the keyer is setup correctly without the emem messing with the status of pgm/pst. Doing a macro to turn on key and do undercut, could do a macro to put the keyer in chroma key, but how about the settings, can a macro hit the GUI and type in #'s for the chroma key level? No keyer snapshots which would work good for this scenario. Could you put one keyer on another partition and assign it a different emem level? Would this take that keyer out of the regular pgm output? thanks Bill
Bob Ennis
User offline. Last seen 4 years 32 weeks ago. Offline
Joined: 24 Aug 2005
On the Standard-Def Kalypso, the 0:4:4 selection was designed to take dvantage of a optional box that GV offered (and may sill offer). This box took RGB & converted it to a black & white signal derived soley from the chromanance of the RGB (Thus the :4:4 portion of the 0:4:4 signal). This became the hole-cutter for the chroma key. In some of my classes & demos, I showed this feature - even the so-called "experts" really couldn't see a big difference between the 0:4:4 & the standard 4:2:2 chroma key (it was easy to fool pretty much everyone who saw it as to which mode was which). I understand that few of these conversion boxes were actually sold. On the HD Kalypso, this is a moot point...the choice isn't even in the menu anymore.

Bob Ennis

Bill D
User offline. Last seen 9 years 50 weeks ago. Offline
Joined: 18 Aug 2005
[quote="sahonen"]It's just a way to get a higher resolution matte out of a chroma key. Since the chroma resolution of standard SDI is half that of the luminance, the resolution of the chroma key matte suffers as well. Some cameras have an 0:4:4 output that sends just chroma info at full resolution, and the switcher can use that to produce a cleaner matte. I've never used it, but I believe it functions like a key-fill pair, if you mate an 0:4:4 input with its 4:2:2 counterpart, you then just punch up the 4:2:2 signal as a chroma key and it will take advantage of the extra chroma information.[/quote] Almost sounds like on the 4K when you could send a RGB signal to a analog chroma key card, similar ideas I suppose. thanks
sahonen
User offline. Last seen 14 years 20 weeks ago. Offline
Joined: 18 Aug 2005
It's just a way to get a higher resolution matte out of a chroma key. Since the chroma resolution of standard SDI is half that of the luminance, the resolution of the chroma key matte suffers as well. Some cameras have an 0:4:4 output that sends just chroma info at full resolution, and the switcher can use that to produce a cleaner matte. I've never used it, but I believe it functions like a key-fill pair, if you mate an 0:4:4 input with its 4:2:2 counterpart, you then just punch up the 4:2:2 signal as a chroma key and it will take advantage of the extra chroma information.
- Stephan Ahonen