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thatblokeoffthetelly
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Layered sequence creates a flashing image

Dec 17, 2010 10:06 PM

I've successfully been layering multiple copies of the same clip to produce some interesting visuals.

With 1 section only the layering produces a flashing image, as if brightness/contrast levels are varying.

My first thought was that they were slightly out of time, so I duplicated the top layer, got rid of the bottom one (there are only two). Then pasted in the copy and applied the old settings from the previous layer, but.. still got the flashing.

Now I've used this effect on all surrounding footage, which was filmed in the same location, and there's no problem.

What would cause this to happen?

 

Effects used:

B/C

Color Balance

Color Balance

ProcAmp

 

Plz bear in mind this occurs on only one of multiple clips and they all use these effects

370 Views   7 Replies   Latest reply: thatblokeoffthetelly, Dec 21, 2010 4:22 AM
 
Replies
  • Jim Simon
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    1. Jim Simon,
    Dec 18, 2010 8:47 AM   in reply to thatblokeoffthetelly
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    What's B/C?

     
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  • Bill Hunt
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    2. Bill Hunt,
    Dec 18, 2010 8:58 AM   in reply to Jim Simon
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    My guess would be Brightness & Contrast.

     

    Is that set to Automatic? If so, that is likely your problem.

     

    Check all of your Effects settings, and disable ANY Auto functions. They WILL likely cause strobing, or pulsing.

     

    Good luck,

     

    Hunt

     
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  • thatblokeoffthetelly
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    3. thatblokeoffthetelly,
    Dec 18, 2010 10:14 PM   in reply to Bill Hunt
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    B/C. Brightness/Contrast yes.

     

    Thx Bill I did try doing that already.

     

    It was the ProcAmp on the top layer. What I don't understand is.. given that it worked on the dozen or so layers in the sequence before this one why would it now start flashing?

     

    The only explanation I could think of was that one was slightly out of time, but this wasn't the case.

     

    Any1 know of anything else that could cause this.

     

    I don't think it's an effect conflict as it works perfectly fine on all clips before and after this one, with exactly the same settings.

     

    Oh, and there is know flashing from lighting or weather on original.

     

    Any input would be greatly appreciated.

     
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  • thatblokeoffthetelly
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    4. thatblokeoffthetelly,
    Dec 18, 2010 10:20 PM   in reply to thatblokeoffthetelly
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    Don't know if this is relevant, but when it plays unrendered, a little slower than final output, there is no flashing.

     
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  • Bill Hunt
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    5. Bill Hunt,
    Dec 19, 2010 8:57 AM   in reply to thatblokeoffthetelly
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    I'm at a loss to explain that. I have used ProcAmp a few times, but in those instances, have not noticed any issues. My experiences were probably like your Clips, where it worked fine, and just never hit the "bad" combo.

     

    Maybe others will have some ideas, or suggestions.

     

    Good luck,

     

    Hunt

     
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  • thatblokeoffthetelly
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    6. thatblokeoffthetelly,
    Dec 20, 2010 12:49 AM   in reply to Bill Hunt
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    Thx anyway bill.

     
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  • thatblokeoffthetelly
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    7. thatblokeoffthetelly,
    Dec 21, 2010 4:22 AM   in reply to thatblokeoffthetelly
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    The clip it affects is slowed down partially. Any1 know how that might cause the flashing?

     
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