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myronm79299567
myronm79299567
Inspiring
February 22, 2018
Question

Hi! Re: deleting background after rotor superimposition

  • February 22, 2018
  • 1 reply
  • 362 views

Hi! Bear with me i am still fairly new to After Effects. Basically I have used the Rotor brush to create a small clip and superimpose Phil against my own background. (below) I want to slow motion the 2 sec clip i have into 8 sec but every time i drag the timewarp effect onto Phil's clip the original background comes up even though i already put him against white and it still seems to play with him against the park pitch in real time. Only thing is i need slow mo and also opacity for Phil as well since he passed. So basically every time i add the timewarp the old original background comes up in a square even though it plays together at normal speed. And i wanna make him transparent opacity ghostly as well. What do I do? Thanks in advance look below for 4 screenshots.

This is where i have the problem.

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1 reply

Mylenium
Mylenium
Legend
February 22, 2018

Magic words of the day: "pre-composing" and "render order". Hacking them in any search engine together with "After Effects" will bring up enough info.

Mylenium

myronm79299567
myronm79299567Author
Inspiring
February 23, 2018

Cheers I tried pre-composing and it still doesn't work. Essentially I just want to slow down the batters footage and keep the field footage (which includes me bowling) at normal speed. It always makes the whole project a slow motion and i don't want the old batters background square coming back into the frame. Any other directions?

R
Community Expert
Rick GerardCommunity Expert
Community Expert
February 23, 2018

If all else fails, render the Rotobrush layer and replace it in the composition. Then work on your time changes and the rest of the composite. More than 90% of the time that I use Rotobrush the layer is rendered with an alpha channel to a visually lossless production format and replaced in the composition. It's usually a more efficient way to work.

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