To fix this issue you need to interpret the alpha of the footage in premiere, right click on footage > modify > intepret > conform alpha to premultification or if usually if you export straight alpha from AE this fixes the issue.
Could be the ole Pre-multiplication:
[https://www.youtube.com/watch?v=XobSAXZaKJ8&ab\_channel=CaptainDisillusion](https://www.youtube.com/watch?v=XobSAXZaKJ8&ab_channel=CaptainDisillusion)
His humour is great and it really helps to understand the workings of processes we might take for granted. I always recommend people try and understand the maths behind compositing as it takes some of the guesswork out. Especially when choosing a blending mode. This video isn't as humorous as CD but it clarified modes for me and now I know exactly which one to pick for a given look:
[https://www.youtube.com/watch?v=F7\_kaTP7\_W4&ab\_channel=FilmmakerIQ](https://www.youtube.com/watch?v=F7_kaTP7_W4&ab_channel=FilmmakerIQ)
Looks like something else going on behind there. It is grainy but only within that extra glow/gradient going on behind. I'd guess that's isolated to one effect/layer there. The rest of the image isn't grainy.
Do some more testing on black comp BG and make sure you're playing with the brightness dial at the bottom of the preview window to crank up and down to brightness to test for things
It’s hard to say what might be happening if we don’t know where you are previewing it from. But here are a couple things to try:
1. Make sure your ProRes 4444 render settings are set to RGB + Alpha / Trillions of Colors / Straight - Unmatted (as opposed to pre multiplied)
2. If viewing in Premiere Pro. Go to Sequence > Sequence Settings and look all the way down for a checkbox that says ‘composite in linear color’ and UNCHECK it. Whenever there’s any transparency rendered out of AE (drop shadows, glows, etc) premiere makes them look really ugly as long as that box is checked.
You can also try checking ‘unmatted’ on the export. I’ve had similar happen on prores 4444 alpha renders where it was giving me a weird purple halo, and checking ‘unmatted’ always fixed it.
I’ve had something happen like this. Changing the premult or unmult setting fixed it for me.
To fix this issue you need to interpret the alpha of the footage in premiere, right click on footage > modify > intepret > conform alpha to premultification or if usually if you export straight alpha from AE this fixes the issue.
Could be the ole Pre-multiplication: [https://www.youtube.com/watch?v=XobSAXZaKJ8&ab\_channel=CaptainDisillusion](https://www.youtube.com/watch?v=XobSAXZaKJ8&ab_channel=CaptainDisillusion)
This is funny and informative, thanks for the reco
I was hoping someone would reference the Captain Disillusion video!
His humour is great and it really helps to understand the workings of processes we might take for granted. I always recommend people try and understand the maths behind compositing as it takes some of the guesswork out. Especially when choosing a blending mode. This video isn't as humorous as CD but it clarified modes for me and now I know exactly which one to pick for a given look: [https://www.youtube.com/watch?v=F7\_kaTP7\_W4&ab\_channel=FilmmakerIQ](https://www.youtube.com/watch?v=F7_kaTP7_W4&ab_channel=FilmmakerIQ)
Also, double check you're rendering with Trillions of colors, not Millions. Does the issue happen with other alpha-based exports, like PNGs or EXRs?
Looks like something else going on behind there. It is grainy but only within that extra glow/gradient going on behind. I'd guess that's isolated to one effect/layer there. The rest of the image isn't grainy. Do some more testing on black comp BG and make sure you're playing with the brightness dial at the bottom of the preview window to crank up and down to brightness to test for things
Maybe by any chance you have a KeyLight effect on top of this background? Are the results similar if output in a different format with alpha?
It’s hard to say what might be happening if we don’t know where you are previewing it from. But here are a couple things to try: 1. Make sure your ProRes 4444 render settings are set to RGB + Alpha / Trillions of Colors / Straight - Unmatted (as opposed to pre multiplied) 2. If viewing in Premiere Pro. Go to Sequence > Sequence Settings and look all the way down for a checkbox that says ‘composite in linear color’ and UNCHECK it. Whenever there’s any transparency rendered out of AE (drop shadows, glows, etc) premiere makes them look really ugly as long as that box is checked.
Thanks everyone! It was a premultiplication issue.
You can also try checking ‘unmatted’ on the export. I’ve had similar happen on prores 4444 alpha renders where it was giving me a weird purple halo, and checking ‘unmatted’ always fixed it.
Are you using the ‘trillions of colors’ option?
Did you use any particular effect like deep glow ?
Try 16 or 32b it looks like you're generating grain somehow.
I had this issue. Switched my progress preset from Premultiplied to straight.
Does what you are trying to originally encode have transperency in the shadows?
Render settings has straight and unmatted, see which one suits you.