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I'm making a horizontal frequency-visualizer in Blender Eevee (because it's fast and it has a nice bloom effect, which will be important later) using the Bizualizer add-on. Since I intend to put it on a video, I figured that a PNG with transparent background would be the easiest to do. Since I wasn't familiar with Eevee, I looked up how to make the world transparent in the render, while maintaining the bloom effect. I ended up using these nodes, and it worked (not my screenshot).

enter image description here

I rendered out some frames for testing, imported the pics into Premiere Pro, And what I noticed was that the "bloom-part" of them had this weird "choppiness"

enter image description here

which I know happens when an image has a bit-depth of only 8 bits (or at least I think that's what it is). So I tried to render it out in 16 bits, but the result was roughly the same. Then I tried adding some dither in the mix, but it didn't really make it better.

Now, I guess I could just do the whole thing in Blender, I mean, I could put the visualizer on the video inside Blender, but it would be easier for me to just render it out as images and then do the rest in Premiere. And also, I'm simply curious what could cause this issue.

Thanks!

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    $\begingroup$ PNG is not the best format to use, and should be avoided for images meant to be composited processed further. Transparent pixels that are luminous, like glows, blooms, etc can only be represented using associated alpha channel, Png uses unassociated alpha, so it is not suited for what you are doing. Use EXR to export such images. Besides the format issue, the "banding" or "quantization error" you describe might persist no matter what if your monitor can only display 8bit images. $\endgroup$
    – susu
    May 26, 2020 at 17:07

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Thanks, Susu, it worked! I rendered out a couple of frames in OpenEXR, imported it into Premiere, and after messing around a little bit with the blend modes, I found that the one called "Lighten" seems to be working perfectly, the bending is gone. Thank you!

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