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unwanted ghosting effect
Hi, I did some compositing work with Keylight in AE cs3 and i followed the Super Tight Junk Mattes podcast that Aharon did, but I keep getting this weird ghosting effect.
Any idea’s on why this is happening??
Paul
SPECS:
Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB -
9 Replies
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Hey I know this is big,
but it’s the only way I could figure it out,
It looks like it’s trying to blend the frames together,
even though I don’t have the frame blending selected…
SPECS:
Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB -
This could be a symptom of separating the fields incorrectly. What is your source footage?
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA -
“This could be a symptom of separating the fields incorrectly. What is your source footage?”
I shot it with a Varicam at 48fps then converted it in Final Cut Pro to
960×720 (1.33)
24.00fps millions of colors DVDPRO HD 720p60is that what you were looking for?
SPECS:
Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB -
Exactly what I was going to say. You shot in 48fps (?), captured at 60 (aka 30i), then exported to 24p. That is a mess, hopefully there was a compelling reason!
When I look at the screen shot, here’s what I see. Your matte is not tracking to the footage properly (seems out of time by a few frames), and as a result it is revealing the green screen that should otherwise be keyed out. The spill suppression is causing the revealed green screen footage to look brown.
That said, I’m not entirely sure this is purely a fps shoot/capture/export issue, because at worst, within After Effects you’d have some minor edge issues but I doubt it would be as bad as you’re experiencing. You may want to double check to ensure that ALL of your comps and subcomps have the proper framerate, are lined up properly etc. because it looks to me like your matte and footage are misalligned by several frames or more. This isn’t really something that the embedded framerate would cause, to my knowledge.
Brendan Coots
Splitvision Digital
http://www.splitvisiondigital.com -
You didn’t by any chance trim your source clip by a few frames and then run the autotrace for the super-tight junk matte?
I’ve seen it to where it will trace the footage from the beginning of the source rather than the current in point of your source footage…causing the autotrace matte to be off by the “trimmed” number of frames.Erik
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[Brendan Coots] “That said, I’m not entirely sure this is purely a fps shoot/capture/export issue, because at worst, within After Effects you’d have some minor edge issues but I doubt it would be as bad as you’re experiencing.”
If the conversions between framerates aren’t handled correctly, then I could definitely imagine that some frame blending might occur. I don’t think it’s necessarily that the matte is off, I think it’s that the frame may be a blend of two frames. This could cause some areas that should be either keyed or solid to be partially green and therefore partially keyed/partially spill corrected.
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA -
Hey guys thanks for all the help!
I backtracked through the after effects comps, and realized that it definitely wasn’t an AE problem. I moved over to Final Cut Pro, and randomly realized that my frame blending was on in FCP!
So I turned it off, and it was fixed!
Thanks SO much for all the help!
Paul Baker
SPECS:
Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB -
What is “fcp” you had mentioned that you turned it off and the prob went away…I have the same ghosting prob and i need to know how to turn off thr fcp
thanks
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When you are in final cut and you change the speed, just deselect the frame blending option.
Hope that helps!
SPECS:
Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB
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