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

  • $\begingroup$ can you post a screenshot of your outliner? $\endgroup$ Jun 20 '19 at 10:40
  • 3
    $\begingroup$ Did you maybe select an output file format that does not support transparency, such as JPG? $\endgroup$ Jun 20 '19 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/… $\endgroup$
    – user1853
    Jul 8 '19 at 14:11