How to delete parts of an image using alpha of another imag?

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  08 August 2012
How to delete parts of an image using alpha of another imag?

I have made 2 image sequences passes 1 with alpha channel the other one with ambient occlusion.

I want to compose them both, but when I do it, it leaves out white grey surrounding from the ambient occlusion.

How do I delete it? How do I take alpha channel values and delete the ambient occlusion sequences, so I could have a nice image sequence with ambient occlusion and with alpha channel preserved.

I can do it in Photoshop by using magic wand clicking on the image with alpha selecting the transparent part then click on the ambient occlusion image and delete the parts I don't want and apply multiply and then merge the layers.

But how do I do it in after effects I have like 200 images by hand in PS it will take ages.

Thank you for any suggestions.

Last edited by monster4ever : 08 August 2012 at 09:18 PM.
  08 August 2012
I sorted it out, put AO above your alpha and set alpha's TrkMat to None, then check/click your AO Preserve Underlying Transparency. It will become available as soon as you set alpha's TrkMat to None.
  08 August 2012
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