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Adding Grain Using Difference Mode
I have a shot that someone composited, but they didn’t add grain to the 3d element they added. (I can’t go back to them for a redo).
Using difference mode and the original plate shot I can isolate, to a fairly good extent, the composited elements.
Ultimately, I would like to end up with a layer or comp that has only grain in the composited places — then I would overlay this onto the original shot.
Can anyone advise me the best way to do this? I assume there’s some way to do this with tracking mattes, but I’ve yet to figure it out.
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3 Replies
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[Oops. I just edited my response because I reread the original post and see that I missed something.]
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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If just using the Difference layer transfer mode already gives you a contrasty image,
then you should get a very good result with the “difference key” effect.Add your original plate (invisible) to a comp
Add the Composited end result to the Comp
Add the Composited again, and apply a difference key you can set the values to be quite harsh. Solo to check the new element is cut out OK. It doesn’t have to be perfect.
Now add Grain to that last layer. -
Thanks Flip — that was it. I’ve never used nor needed a difference matte before so I was trying to go around the hard way.
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