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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Helium Yellow Banding

Kenneth C Merrill

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UPDATED. Can someone tell me what this weird yellow banding is in the the background? It's in a large portion of the footage I'm cutting (someone else shot).

vdiurc.png


UPDATE:

OK, so I decided to hold off further inquiry until I had some footage I shot for myself that was showing the same issue. We shot most of this project in 8K, some in 6K, using Leica R lenses. My firmware is not the latest release firmware but rather the release-candidate firmware that came right before that. I haven't had any problems with the release-candidate; so I chose to keep it until the release has ALL the kinks worked out (I've heard of some people having problems). We shot 2K 4444 proxies with the honest hope that I would be able to just cut and color those. 2K 4444 out of the Alexa has always looked beautiful, and I was hoping for a similar result with this--I still shot the R3D, though, because you never know, and I did plan for some digital pushes in post. Anyway, after cutting some of the 2K footage together, I applied the IPP2 Med Contrast, Very Soft lut to all of the clips in my timeline, and immediately I saw this horrible yellow splotchiness in ALL of the clips.

Here is a frame from one of the shots. It's out of focus because the subject steps into frame a few seconds later. I think this is a good frame to look at because the wall is uniformly lit. The only light sources in the room were the windows, a Litemat 4SL and a Litemat 2SL Plus. All daylight-balanced.

KjEoTcM.jpg


I was dismayed to see the yellow coloration show up, but I immediately imported the matching R3D clip into the project and took a snapshot of that in Premiere also. Same development settings and LUT.

5ZTULWt.jpg


As you can see, no yellow! Now, I'm not sure why I'm still seeing yellow splotches in the footage from the other project (with the cat), even when I'm cutting R3D. I'll investigate that tonight.

At any rate, I can't understand why 4444 footage wouldn't stand up to a simple transform without going all weird like this. I was really excited at the potential of just shooting ProRes on the occasional project with the Red Epic-W, but this has made me hesitate. There's something really weird going on with it. Thoughts?
 
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That's weird. Do you have an .R3D so we can investigate? I've seen odd banding on some light sources, but that's a general cinematography/shutterspeed thing.
 
Don't regard my comment as being valid. There are wiser and smarter people here than I.

The colour artifact does not seem to have the straight edges one might assume come from a sensor or processing fault.

It looks to me a contaminated lighting issue. A source, in a low position is illuminating most of the wall, maybe a reflection of sunlight off a polished wooden floor, wooden table, or a desk lamp. If you look at the area above the curtain rod, you can see a "shadow" comprised of the same colour. - Proper lighting guys will be able to better assess this than myself.
 
If you can, submit these images to support or your Rep. I have yet to experience this issue, but I role ProRes rarely. I have a theory as to what's going on, but the engineers really need to see it.
 
So I was working on another project today, shot on C300 MkII, and I applied a REC709 LUT to the footage, and to my surprise there was the yellow banding again! Didn't see that coming.

So, I search for "Premiere lumetri yellow banding" in Google, and I immediately have my suspicions confirmed. It turns out that starting with CC 2017, Premiere has not played well with Metal GPU acceleration (which is my best option on a Mac Pro trash can). As soon as I select OpenCL acceleration, the yellow banding goes away. Mystery solved.

Now I have to go let Adobe know I have a bone to pick with them.
 
So I was working on another project today, shot on C300 MkII, and I applied a REC709 LUT to the footage, and to my surprise there was the yellow banding again! Didn't see that coming.

So, I search for "Premiere lumetri yellow banding" in Google, and I immediately have my suspicions confirmed. It turns out that starting with CC 2017, Premiere has not played well with Metal GPU acceleration (which is my best option on a Mac Pro trash can). As soon as I select OpenCL acceleration, the yellow banding goes away. Mystery solved.

Now I have to go let Adobe know I have a bone to pick with them.

Thank you for updating this find- good to know it wasn't a Pro Res thing in camera.
 
So, I search for "Premiere lumetri yellow banding" in Google, and I immediately have my suspicions confirmed. It turns out that starting with CC 2017, Premiere has not played well with Metal GPU acceleration (which is my best option on a Mac Pro trash can). As soon as I select OpenCL acceleration, the yellow banding goes away. Mystery solved.
That's a very interesting problem. Thanks for sharing the solution!
 
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