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Static Shot, remove part of the background

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Christoph Piasetzki
Static Shot, remove part of the background
on May 1, 2019 at 7:30:10 pm

Hello people at creative cow

I'm trying to figure out a more elegant way to remove a painting on the background of a static shot, where the acting person in the foreground is covering part of the painting from time to time.

What I learned in this forum is to build an alpha channel through superimposing a still frame of the (person-less) room with the shot (blend mode: difference, then apply threshhold) and using this luminance-only result as the source for an image mask on the actual shot (source: luminance). By this 'difference matte' the moving person is keyed an I could replace the complete background with a painting-less version.

But I think there has to be a way, where there's not the full video being harshly processed, but only the part where the picture is, right? Does anybody have another solution because my brain hurts right now..

Thanks!
Chris


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