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How Do I Use The White Values Of A Black and White PNG To Restrict An Effect To That Area?

Community Beginner ,
Sep 12, 2021 Sep 12, 2021

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As the title says. I have here an image of something that I rendered in C4D, and an "Object Buffer" render of a part of my original image (it is a black and white png, I'll attach the images here). I am not sure about a proper workflow on how to restrict a specific effect to use the black and white png as a base to restrict its effect on the original image (white part is the only part that is affected, and the black pixels are untouched)

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Adobe Community Professional ,
Sep 12, 2021 Sep 12, 2021

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you need to use a luma matte, check this to learn more about how to use that https://www.schoolofmotion.com/blog/how-to-use-track-mattes-after-effects 

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