Superwhites - workflow suggestions? at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon XA and VIXIA Series AVCHD Camcorders > Canon VIXIA Series AVCHD and HDV Camcorders

Canon VIXIA Series AVCHD and HDV Camcorders
For VIXIA / LEGRIA Series (HF G, HF S, HF and HV) consumer camcorders.


Reply
 
Thread Tools Search this Thread
Old September 8th, 2009, 11:17 AM   #1
Trustee
 
Join Date: May 2004
Location: Knoxville, Tennessee
Posts: 1,666
Superwhites - workflow suggestions?

The AVCHD files that my HF10 produces contain superwhites - i.e. highlight details above 100 IRE.

I'd be interested to hear how others are handling this - particularly ways to transcode to intermediate formats without those superwhites being clipped during transcoding.

One suggestion I've seen is uses TMPGEnc, with a reduced-luminance or reduced-contrast filter applied to the source AVCHD footage.
Graham Hickling is offline   Reply With Quote
Old September 8th, 2009, 12:02 PM   #2
Regular Crew
 
Join Date: Aug 2009
Location: Chester, UK
Posts: 48
I'm not sure using a brightness or contrast filter when creating your intermediaries is a good idea, because information lost there can't be recovered in your NLE. What intermediary format and colour space are you using? CineForm NEO Scene will retain all levels, which I then correct in Vegas.
Stuart Robinson is offline   Reply With Quote
Old September 8th, 2009, 03:00 PM   #3
Trustee
 
Join Date: May 2004
Location: Knoxville, Tennessee
Posts: 1,666
I'm converting from AVCHD to Cineform using HDLink, from the latest ProspectHD4.

The resulting CFHD avis have the superwhites clipped off (to my surprise, since that isn't the case with CFHDs originating from my HDV footage).

I posted about this on the Cineform forum last night, to see if this is consistent with what others are finding, but no responses so far.
Graham Hickling is offline   Reply With Quote
Old September 8th, 2009, 03:40 PM   #4
Regular Crew
 
Join Date: Aug 2009
Location: Chester, UK
Posts: 48
I'll keep an eye on your CineForm thread.

If it helps at all, putting an AVCHD file side-by-side with the same file converted to CineForm via HDLink in NEO on the same timeline, I can see a change of levels - the CineForm levels being fractionally higher (the mean shifts by about two points) but the luminance values extend well above 100 IRE, so I'm not seeing any hard clipping at that point.

Out of interest, do you have the ITU.Bt.709 colour space enabled in the VfW CODEC?
Stuart Robinson is offline   Reply With Quote
Old September 8th, 2009, 08:24 PM   #5
Trustee
 
Join Date: May 2004
Location: Knoxville, Tennessee
Posts: 1,666
Thanks for the response. I have 709 enabled for both encode and decode. I have 'Video systems RGB' disabled for both. Does that sound right?
Graham Hickling is offline   Reply With Quote
Old September 9th, 2009, 10:13 AM   #6
Trustee
 
Join Date: May 2004
Location: Knoxville, Tennessee
Posts: 1,666
Hmmmm ..... this seems to be a CS3 vs. CS4 thing. When I pull my transcoded CFHD-avi into a CS4 timeline, the superwhites are there and the YC waveform is essentially identical to the original AVCHD footage.

But when I pull the same CFHD-avi into CS3 everything above 100IRE is gone!

Since this isnt a problem with the HF10, I'll quit this thread and carry on in the Cineform forum: Superwhites in AVCHD footage
Graham Hickling 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 > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon XA and VIXIA Series AVCHD Camcorders > Canon VIXIA Series AVCHD and HDV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:30 AM.


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