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I rendered hundreds of frames and when I reviewed the results I found that the camera can see 'through' my stack of objects to the background and a grid pattern is visible. I could render again with an object to block the light path but I'm curious if compositing provides another approach.

Is it possible to use compositing to remove such patterns in rendered images?

enter image description here

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You could use the Mist pass with a color ramp and color invert to strengthen it, or you could do like the included image, enable an Object Index pass so you could then get a strong mask and invert it to affect the areas outside of the object.enter image description here In this way, even if you need to render frames again, you can lower your settings all the way so that the result is as small as possible and just use the pass to affect the frames you already have.

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