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Is it possible to save a file output after rendering that wasn't previously set up in the node editor when rendered?

For example if I rendered a scene with all of the passes send to an .exr but then wanted to just render the combined image to a png. When the scene was rendered only the export to .exr was set up and the .png wasn't. Is there any way to do this without rendering again?

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    $\begingroup$ Yes there is, you can use the File Output node in the compositor for this $\endgroup$ – Duarte Farrajota Ramos Oct 28 '16 at 23:52
  • $\begingroup$ How do you save the file from the File Output node after it is connected with the passes you want to export? $\endgroup$ – Animatoring Oct 29 '16 at 0:07
  • $\begingroup$ When I connected the .exr it output it automatically but if I add another file output node after rendering is there a way to still export the file from the file output node afterwards without rendering? $\endgroup$ – Animatoring Oct 29 '16 at 0:12
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    $\begingroup$ I don't have a lot of practical experience with the node, see the Blender Manual - File Output Node for more info $\endgroup$ – Duarte Farrajota Ramos Oct 29 '16 at 3:17
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    $\begingroup$ No need to re-render. Import that rendered EXR and plug the channel(s) you want to save to a file output node to create a png file. $\endgroup$ – cegaton Oct 29 '16 at 4:11

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