I was doing some motion tracking and I implemented some smoke. Once I rendered the scene, there is this bright perimeter framing my smoke. I'm not sure if this is a bug or not but i would like to know how to remove it.enter image description here

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    $\begingroup$ What format did you render smoke in to overlay on the footage ? This looks like a wrong treating of the alpha channel and it's best to render smoke into OpenEXR (or maybe .tiff) to overlay later. Maybe related - blender.stackexchange.com/questions/44358/… $\endgroup$ – Mr Zak Dec 22 '16 at 0:15
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    $\begingroup$ Please use the edit link and add more information to your question. How are you overlaying the image? What are your render setings? What format? etc. $\endgroup$ – user1853 Dec 22 '16 at 3:17
  • $\begingroup$ It could be the blend mode or the alpha mask that is doing this. $\endgroup$ – VRM Dec 22 '16 at 4:00
  • $\begingroup$ Potentially related: blender.stackexchange.com/q/67884/599, blender.stackexchange.com/q/38459/599, and blender.stackexchange.com/q/67346/599 $\endgroup$ – gandalf3 Dec 22 '16 at 5:16
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    $\begingroup$ It looks like there is a misplaced pre-division or wrong interpretation of a unassociated alpha image. Easy to test: using the "convert premul" checkbox in the alpha over node should either mitigate or eliminate the problem. Hard to tell without more information (what cegaton asked above) $\endgroup$ – Gez Dec 22 '16 at 16:49

I don't know if this is your issue, but you should give it a try :D

check convert premul

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    $\begingroup$ Please add more detail to the answer as text. Don't rely on images only. Add a small explanation of what you are doing. Also if you are uploading images make sure that they are legible. It is impossible to read what node and options you are using. $\endgroup$ – user1853 Apr 4 '18 at 14:19

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