I want to make animation in Blender. It will be transition for video. In video editing software I will put this animation over junction of two parts of video.

In Blender I will make output as PNG sequence. Next step I will import PNG sequence to some video editing software. Maybe OpenShot, Shotcut, Kdenlive, DaVinci Resolve. Maybe some else.

Do I need to optimize PNGs after I will output them from Blender and before I will import them to video editing software?

  • 3
    $\begingroup$ Never ever render to png. Render to OpenEXR: blender.stackexchange.com/a/106671/31447 $\endgroup$
    – brockmann
    May 8, 2020 at 7:32
  • $\begingroup$ @brockmann Thank you, brockmann. I took in attention your words. I took in attention the material you pointed. In blender.stackexchange.com/questions/106670/… troy_s wrote "their alpha values are unassociated by design". What does it mean? $\endgroup$
    – Konskoo
    May 8, 2020 at 8:51
  • 1
    $\begingroup$ @Konskoo Unassociated (straight) alpha offers less precision compared to Associated (premultiplied). This leads to ugly borders between transparent/opaque areas. Wikipedia - Alpha Compositing $\endgroup$ May 8, 2020 at 9:22
  • $\begingroup$ @JachymMichal Thank you, Jachym. I took in attention your words. I took in attention the information in Wikipedia - Alpha Compositing. I want to use more precision. Because of it I want to use associated (premultiplied) alpha. Does in OpenEXR associated (premultiplied) alpha set as default? $\endgroup$
    – Konskoo
    May 8, 2020 at 10:36
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    $\begingroup$ I’m voting to close this question because it is not about using blender. $\endgroup$ May 8, 2020 at 12:20

1 Answer 1


No, assuming by optimize you mean with an optimizer such as pngcrush. These optimizers are designed to strip out extra information in the file in order to reach the smallest acceptable file size, which seems unlikely to matter much for files that will only be used while you're editing your video. If optimizing accomplishes anything, it'll be to optimize away information which might have been useful when making further tweaks in your video editor.

As brockmann pointed out in the comments, using EXR is preferable to PNG, if your video editing software supports it.


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