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Banding in XAVC Slog3/cine Cine EI footage


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#1 Robin R Probyn

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Posted 06 June 2015 - 01:54 AM

Shot this  UN LUTed .. its had some LUT applied for editing.. got message from editor about banding problem.. 

 

Don't have access to the edit .. he says he has seen it ,to a lesser extent on the original XAVC footage..

 

As I know it banding is from compression and low bit rate codec.. but 10 bit 100 Mbps should be fine for this shot.. 

 

I really cant understand how this could be on the original footage..  any ideas.. ??? 

 

Thanks

 

Here is the LUTed clip sent to me.. banding on the wall to his left.. day light ..XAVC HD 25p Canon CN7 lens

 

https://www.dropbox....r wall.tif?dl=0


Edited by Robin R Probyn, 06 June 2015 - 01:58 AM.

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#2 Mark Dunn

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Posted 06 June 2015 - 09:26 AM

Is it definitely not image detail? It seems to peter out.


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#3 Robin R Probyn

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Posted 12 June 2015 - 03:47 AM

Hi Mark

 

Just thought I,d let you know.. it was an Avid import problem and 8 bit monitors that bought about the banding.. the XAVC camera footage was totally fine..

 

Thanks


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#4 Phil Rhodes

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Posted 12 June 2015 - 04:53 AM

I'd be interested in knowing exactly how 8 bit monitoring affected things. Practically all displays are 8 bit, outside the highest of high end.


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#5 Robin R Probyn

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Posted 13 June 2015 - 07:17 PM

well apparently so..Im not the editor..  and some setting on Avid.. full quality 10bit..and the LUT that was applied..  when watched in catalyst the original Slog3l XAVC was fine.. 


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#6 Phil Rhodes

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Posted 13 June 2015 - 07:38 PM

Hmm. LUTs themselves can cause banding - they're only of limited internal resolution, usually 16 entries cubed.

 

P


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#7 Robin R Probyn

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Posted 14 June 2015 - 07:18 PM

Yes just seemed some unlucky combination of things.. A high res transcode,not the correct setting in Avid.. there is a full quality setting.. but click it again and full quality 10 bit comes up.. and maybe the LUT.. there were a few others who had similar on the Sony F55/5 forum .. the editor and guess the dir ! were just worried it was some camera /setting problem.. but at the same time knew it could be their end too.. 

Usually I would have a copy of the footage at home,but here I didnt..typical ! 

 

Bit shocked when I got the email.. but thought 10 bit recording Slog XAVC,for that particular shot and that stop would be unlikely.. but  couple of nervous days before the XAVC was tested and found to be ok.. 

I guess XAVC and Sony Slog3 is still a bit new to many editors.. 

But thanks for your time and input sir


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