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How to stop colour banding in vignettes?

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Michael Lansdell
How to stop colour banding in vignettes?
on Sep 20, 2010 at 9:17:18 am

Hi, I like to put a very slight vignette on programmes when I'm doing the final grade and graphics etc. I used to use a pre-made vignette knocked up in Photoshop but now I use a colour matte with a mask shape cut out so I can adjust it easily for different shots if I want to. I used the 'Soft Light' transfer mode for both of these as I like the subtler effect it has to some other transfer modes, and I use it at varying opacity, but mostly between 36-46% I also grade in 'Uncompressed 8 bit 4:2:2', and for SD PAL broadcast.

My problem is, I get weird colour-banding sometimes, mostly noticeable over mid darkness areas of flatish colour. Is there something I can do to prevent that?

Many thanks,

Michael Lansdell

Online/Offline Editor

My system:

2 x 3 GHz Quad-Core Intel Xeon
5GB DDR2 RAM
512MB ATI Radeon X1900 XT
OS X 10.4.11
Final Cut Pro 6.0.4
After Effects CS4
Blackmagic Design DeckLink HD Extreme (6.6.2)

Take a gander at my personal blog:

http://www.monstersareart.co.uk


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Rafael Amador
Re: How to stop colour banding in vignettes?
on Sep 20, 2010 at 9:39:54 am

Hi Michael,
The banding is a problem associated with the 8b.
You may try add a bit of noise to the vignette, or render in 10b.
If you render in 10b you can add a bit of blur to your Photoshop file (8b RGB).
Rafael

http://www.nagavideo.com


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Bouke Vahl
Re: How to stop colour banding in vignettes?
on Sep 20, 2010 at 10:29:54 am

Rafael is right, BUT:
10 bit does do the trick, but is not the solution, as your work probably ends up in 8 bit anyways...
(Broadcast is most of the time 8 bits nowadays...)

Experiment with noise....

Bouke

http://www.videotoolshed.com/
smart tools for video pros


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Stephen Smith
Re: How to stop colour banding in vignettes?
on Sep 20, 2010 at 2:39:23 pm

Take a look at: Effects, Video Filters, Image Control, Reduce Banding.

Best of luck.

Stephen Smith
Utah Video Productions

Check out my Motion Training DVD

Check out my Motion Tutorials


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Mark Suszko
Re: How to stop colour banding in vignettes?
on Sep 20, 2010 at 3:07:29 pm

Question: is his photoshop file of the vignette the wrong resolution, and could this be causing banding when it is scaled too much?


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Wayne Carey
Re: How to stop colour banding in vignettes?
on Sep 20, 2010 at 4:30:26 pm

You get this same banding when using the vignette plug also. Whether the plugin be from Apple, Noise Industries, Tiffen or anyone, you'll see this banding. Yes, 10-bit rendering does make it look good but Stephen is right, most all broadcast facilities are airing in 8-bit, so the banding comes back on broadcast.

_______________________________

Wayne Carey
Schazam Productions
http://web.mac.com/schazamproductions
schazamproductions@mac.com


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Bouke Vahl
Re: How to stop colour banding in vignettes?
on Sep 20, 2010 at 4:33:42 pm

Hello Dave!
You are my wife now, Dave!


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Stephen Smith
Re: How to stop colour banding in vignettes?
on Sep 20, 2010 at 4:37:22 pm

Bouke,
I don't get it?

Stephen Smith
Utah Video Productions

Check out my Motion Training DVD

Check out my Motion Tutorials


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