Color and luminance shift during conversion at DVinfo.net

Go Back   DV Info Net > Cross-Platform Post Production Solutions > CineForm Software Showcase

CineForm Software Showcase
Cross platform digital intermediates for independent filmmakers.


Reply
 
Thread Tools Search this Thread
Old February 27th, 2011, 04:16 PM   #1
Major Player
 
Join Date: Jun 2007
Location: Medford, OR
Posts: 347
Color and luminance shift during conversion

I am converting some Z1 HDV footage (captured in Vegas over firewire) with HDLink to 1920x1080 Cineform, high quality, interlaced.

The resulting footage when compared to the original in Vegas has a slight luminance drop and a shift towards green. Is this normal? I'm using the latest release of NEO HD 5.

Thank you, Marc
Marc Salvatore is offline   Reply With Quote
Old February 27th, 2011, 11:59 PM   #2
Major Player
 
Join Date: Oct 2002
Location: Albuquerque, New Mexico USA
Posts: 326
Re: Color and luminance shift during conversion

I've noticed this, too.
John Cline is offline   Reply With Quote
Old March 1st, 2011, 03:24 PM   #3
Major Player
 
Join Date: Jun 2007
Location: Medford, OR
Posts: 347
Re: Color and luminance shift during conversion

John,

I filed a ticket and they are looking into it. I'll let you know.
Marc Salvatore is offline   Reply With Quote
Old March 1st, 2011, 07:21 PM   #4
Major Player
 
Join Date: Jun 2007
Location: Medford, OR
Posts: 347
Re: Color and luminance shift during conversion

John,

Just got a message that they found the problem and it will be fixed in the next build. Cineform has amazing customer service!
Marc Salvatore is offline   Reply With Quote
Old March 2nd, 2011, 05:43 PM   #5
Major Player
 
Join Date: Oct 2002
Location: Albuquerque, New Mexico USA
Posts: 326
Re: Color and luminance shift during conversion

Great! This is good news, the slight green shift has been there for a while. I'm curious now whether this has been an encoding or a decoding issue.
John Cline is offline   Reply With Quote
Old March 2nd, 2011, 09:48 PM   #6
CTO, CineForm Inc.
 
Join Date: Jul 2003
Location: Cardiff-by-the-Sea, California
Posts: 8,090
Re: Color and luminance shift during conversion

It is a decoding issue, that was accidentally introduced back in August '10 when we added the uncompressed modes to the CineDeck capture/player. It only impact YUV I-frame encoding, and it is subtle. Existing files will not need to be re-encoded once 5.3.2 is out.
__________________
David Newman -- web: www.gopro.com
blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman
David Newman is offline   Reply With Quote
Old March 3rd, 2011, 03:16 AM   #7
Major Player
 
Join Date: Oct 2002
Location: Albuquerque, New Mexico USA
Posts: 326
Re: Color and luminance shift during conversion

This, too, is great news. I have a LOT of Cineform encoded footage!
John Cline is offline   Reply With Quote
Old March 9th, 2011, 02:58 PM   #8
Major Player
 
Join Date: Oct 2002
Location: Albuquerque, New Mexico USA
Posts: 326
Re: Color and luminance shift during conversion

I just heard that Cineform now considers this a "low priority" fix, well it's not a low priority for me! This bug affects image quality and image quality is why I bought Neo HD in the first place.
John Cline is offline   Reply With Quote
Old March 9th, 2011, 03:43 PM   #9
Major Player
 
Join Date: Aug 2004
Location: Clermont, FL.
Posts: 941
Re: Color and luminance shift during conversion

Anything like this that is related to quality will keep me from using this until it is fixed. Any idea of a timeframe for this fix?
Laurence Kingston is offline   Reply With Quote
Old March 9th, 2011, 03:58 PM   #10
Major Player
 
Join Date: Jun 2007
Location: Medford, OR
Posts: 347
Re: Color and luminance shift during conversion

I upgraded to NEO HD 5 so I could use it in Vegas 10 on a project that needs a large amount of HDV footage converted to 1920x1080. I'm not really comfortable with getting a green shift on all of the footage during conversion. Seems like a quality hit to me. I hope this gets fixed soon so I can use the product as intended.
Marc Salvatore is offline   Reply With Quote
Old March 9th, 2011, 04:18 PM   #11
CTO, CineForm Inc.
 
Join Date: Jul 2003
Location: Cardiff-by-the-Sea, California
Posts: 8,090
Re: Color and luminance shift during conversion

The luminance bug is fixed, there is no longer a codec issue. This is why posting half information from support is not all that helpful. The remaining issue is related to the 1440x1080 to 1920x1080 upscale in HDLink, that is not new as it is always been that way, and is really minor. We had not noticed this shift until the the other bug was discovered. I expect that it would never have been reported/discovered if it wasn't for the now fixed error. You don't need to use the upscale, and you have upscale in the NLE if needed, so it is only a convience feature (plus if you use FirstLight it completely doesn't matter.) This is why it is reasonable to be lower priority that other items on our plate.
__________________
David Newman -- web: www.gopro.com
blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman
David Newman is offline   Reply With Quote
Old March 9th, 2011, 05:29 PM   #12
Major Player
 
Join Date: Jun 2007
Location: Medford, OR
Posts: 347
Re: Color and luminance shift during conversion

My complaint from the start was color shift when resizing. When support told me they fixed it I tried it again and found it was still a problem. When I asked them to make sure they were resizing they confirmed that was the problem. Guess I'll need to consider another workflow without resizing because the shift is more than minor to me.

Marc
Marc Salvatore is offline   Reply With Quote
Old March 9th, 2011, 06:05 PM   #13
CTO, CineForm Inc.
 
Join Date: Jul 2003
Location: Cardiff-by-the-Sea, California
Posts: 8,090
Re: Color and luminance shift during conversion

Really? I even can't see on a waveform display for my HDV images. The reason we thought we found it was we did tiny a small shift in the decoder -- with the decode we can ran it through a 100 generation to make shifts more visible, as the first generation was not obvious. So we have fixed the issue for 99.9% of users.
__________________
David Newman -- web: www.gopro.com
blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman
David Newman is offline   Reply With Quote
Old March 9th, 2011, 06:22 PM   #14
Major Player
 
Join Date: Jun 2007
Location: Medford, OR
Posts: 347
Re: Color and luminance shift during conversion

It's the shift to green I'm concerned about. The luminance issue is not a big deal to me. I will just not scale at this point since that fixes the issue.
Marc Salvatore is offline   Reply With Quote
Old March 9th, 2011, 06:31 PM   #15
CTO, CineForm Inc.
 
Join Date: Jul 2003
Location: Cardiff-by-the-Sea, California
Posts: 8,090
Re: Color and luminance shift during conversion

I'm having a difficult time seeing the green shift, an invisible error is harder to fix. I think Jake as a test example from you as my HDV clips don't do it.
__________________
David Newman -- web: www.gopro.com
blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman
David Newman 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 > Cross-Platform Post Production Solutions > CineForm Software Showcase

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:20 PM.


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