Jump to content


Photo

Vertical Banding on s16


  • Please log in to reply
10 replies to this topic

#1 Luke Randall

Luke Randall
  • Basic Members
  • PipPip
  • 46 posts
  • Director
  • L.A

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.

  • 0

#2 Tyler Purcell

Tyler Purcell
  • Sustaining Members
  • 4251 posts
  • Other
  • Los Angeles

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.
  • 0

#3 Luke Randall

Luke Randall
  • Basic Members
  • PipPip
  • 46 posts
  • Director
  • L.A

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.
  • 0

#4 Dirk DeJonghe

Dirk DeJonghe
  • Basic Members
  • PipPipPipPip
  • 614 posts
  • Industry Rep
  • Kortrijk,Belgium

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.


  • 0

#5 Kenny N Suleimanagich

Kenny N Suleimanagich
  • Basic Members
  • PipPipPipPip
  • 902 posts
  • Cinematographer
  • New York

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. 


  • 0

#6 Luke Randall

Luke Randall
  • Basic Members
  • PipPip
  • 46 posts
  • Director
  • L.A

Posted 08 December 2015 - 02:54 PM

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


  • 0

#7 David Cunningham

David Cunningham
  • Basic Members
  • PipPipPipPip
  • 1054 posts
  • Cinematographer

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.
  • 0

#8 Luke Randall

Luke Randall
  • Basic Members
  • PipPip
  • 46 posts
  • Director
  • L.A

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.


  • 0

#9 Will Montgomery

Will Montgomery
  • Sustaining Members
  • 2103 posts
  • Producer
  • Dallas, TX

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.


  • 0

#10 Phil Rhodes

Phil Rhodes
  • Sustaining Members
  • 12283 posts
  • Other

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.


  • 0

#11 Robert Houllahan

Robert Houllahan
  • Sustaining Members
  • 1651 posts
  • Industry Rep
  • Providence R.I.

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.


  • 0


Paralinx LLC

The Slider

Abel Cine

CineLab

Glidecam

Willys Widgets

Tai Audio

New Pro Video - New and Used Equipment

Broadcast Solutions Inc

Metropolis Post

rebotnix Technologies

Gamma Ray Digital Inc

Wooden Camera

Ritter Battery

CineTape

FJS International, LLC

Technodolly

Rig Wheels Passport

Media Blackout - Custom Cables and AKS

Aerial Filmworks

Visual Products

Tai Audio

Visual Products

rebotnix Technologies

Technodolly

New Pro Video - New and Used Equipment

Rig Wheels Passport

Wooden Camera

Broadcast Solutions Inc

FJS International, LLC

Media Blackout - Custom Cables and AKS

CineLab

Glidecam

The Slider

Gamma Ray Digital Inc

Abel Cine

Willys Widgets

CineTape

Aerial Filmworks

Ritter Battery

Metropolis Post

Paralinx LLC