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Vertical Banding on s16


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#1 Luke Randall

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Posted 08 December 2015 - 02:23 AM

Hi,

 

I got some scans back of my test footage and there's some verticle banding in high exposure areas like sky at times. It was shot on an SRII with vision 250D and 500T, same issue on two separate mags.

 

Processed normally then scanned to prores 4444.

 

I've attached a pic of the issue at it's worst for illustration purpose. Can anyone can shed some light on what this artifact might be?

 

Thank you

 

strips.jpg


Edited by Luke Randall, 08 December 2015 - 02:23 AM.

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#2 Tyler Purcell

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Posted 08 December 2015 - 03:54 AM

Maybe it's old stock? Can you upload a video clip? It would be interesting to see how the pattern plays out. Generally bad stock can be identified quickly that way.
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#3 Luke Randall

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Posted 08 December 2015 - 04:03 AM

I don't think it's the stock. I used a 400ft roll of 250d and 100ft roll of 500t purchased from different sources.

I can definitely upload a clip when I'm back at my machine though.
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#4 Dirk DeJonghe

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Posted 08 December 2015 - 06:37 AM

If it was transfered on a CCD telecine such as Spirit or Shadow, it is very likely failed FPN compensation. (Fixed Pattern Noise). Ask for a new telecine transfer and show the defect.


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#5 Kenny N Suleimanagich

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Posted 08 December 2015 - 10:49 AM

You can also inspect the negative to be absolutely sure it's not your camera, but Dirk is probably right. Looks like FPN from the telecine. 


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#6 Luke Randall

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Posted 08 December 2015 - 02:54 PM

Thank you for the replies guys, sounds like it was a problem with the scan.


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#7 David Cunningham

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Posted 08 December 2015 - 04:41 PM

I have seen that before on scanners that are not properly calibrated and thus are creating vertical line noise in the bright highlights which are actually very deep blacks in the negative itself... Like trying to get the detail out of the shadows on a print, the sensor is creating that noise trying to get the detail out of those highlights. Definitely a scanner issue.
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#8 Luke Randall

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Posted 08 December 2015 - 05:34 PM

Thanks David. 

 

Yes I think it was a scanning issue, apparently a custom profile at the scanning end would likely nix the problem. I'm just glad it's not an issue with the camera.


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#9 Will Montgomery

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Posted 10 December 2015 - 10:04 AM

Did you physically inspect the footage with a loop/light table? That would settle the issue quickly. If it is on the film itself, I would look at the processing. But I agree it's mostly likely a scanner problem.


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#10 Phil Rhodes

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Posted 10 December 2015 - 10:20 AM

If that's not a scan problem, I'll be very pleased to eat my hat and everyone else's, with or without appropriate condiments.


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#11 Robert Houllahan

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Posted 14 January 2016 - 04:09 PM

Definitely the scan, was it a new scanner like the Scan Station, Xena or Kinetta? then it is a dense negative hilites showing the fixed pattern noise in the shadow range of the CMOS sensor.

 

If it was a Shadow or Spirit or other line scan system it's a FPN calibration issue and possibly some dirty optics in the gate.

 

Send it back for a rescan with different light values should be a free redo.


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