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This question already has an answer here:

I want to render out only the trail that I can composite it individually. So when I render it out without a Background -> Transparent Background, then my Trail looks grey and is really hard to see. I hope you can help me out it is really important for me to know how to fix it.enter image description here

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marked as duplicate by cegaton rendering Jul 8 at 14:11

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  • $\begingroup$ can you post a screenshot of your outliner? $\endgroup$ – miceterminator Jun 20 at 10:40
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    $\begingroup$ Did you maybe select an output file format that does not support transparency, such as JPG? $\endgroup$ – Oliver Giesen Jun 20 at 10:58
  • $\begingroup$ The information is there, but the render viewer has an old bug, where it cannot show emissive and transparent pixels (it doesn't show associated alpha correctly) read: blender.stackexchange.com/questions/57816/… $\endgroup$ – cegaton Jul 8 at 14:11