Crazy blue shimmer with Lumetri Black level

[Greg Janza]

After doing a baseline color grade, if you still feel that individual areas of your frame need adjusting, the secondary color grade within the lumetri panel can be very helpful:

https://www.youtube.com/watch?v=oPnESo_qfCI

Windows 10 Pro | i7-5820k CPU | NvidiaGeForceGTX970 | Blackmagic Decklink 4k Mini Monitor |
Adobe CC 2018 |Renders/cache: Samsung SSD 950 Pro x2 in Raid 0 | Media: Samsung SSD 960 PRO PCIe NVMe M.2 2280 | Media: OWC Thunderbay 4 x 2 Raid 0 mirrored with FreeFileSync

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[Oliver Peters]

[mark thompson] “It is interesting as to what the blacks do.”

Look at the last graphic at the bottom of that blog post. That’s what is happening to your image. Not as extreme, but in general. Because you also have chroma, it has additional effect to the chroma, which is what you are interpreting as “shimmering”.

– Oliver

Oliver Peters – oliverpeters.com

[Rich Rubasch]

Hey all….this is not a factor of his footage….we’ve seen this bug in lumetri since CC2017 came out. We actually have copied the CC2015 version of Lumetri into our CC 2017 install to solve this bug.

I noticed it one day on a headrest in a car interior….had never seen it before. Once you see it you’ll know what it is, and it’s Lumetri. We finally solved it by purchasing Colorista and installing that in all our systems.

Four editors here all confirmed this bug that found its way into Lumetri in CC 2017.

If you can, try this same effect on the same clip in CC 2015 Premier and you will see smooth blacks and no increase of saturation in the blacks.

What’s worse, if we color correct on one system and then open the same project in another system and make any adjustments to any setting in Lumetri, the entire clip changes it’s overall look completely. As if Lumetri could not replicate what it had done on the other system….all our systems are the same….and we tried it with software only turning off any video card processing.

It’s Lumetri in CC 2017 and CC 2018. CC 2015 was rock solid across all our systems.

Rich Rubasch
Tilt Media Inc.
Video Production, Post, Studio Sound Stage
Founder/President/Editor/Designer/Animator
https://www.tiltmedia.com

[Mark Thompson]

I like the video, I have used that before but not very much.
I turned the blue jackets green!
Alas it was a noisy green. I’m still testing though.

[Mark Thompson]

thanks for that post, I’m glad I’m not the only one! I will try Colorista and see how that works.

I’ve also got Neat so I’ll be busy for a few days.

mark

[Rich Rubasch]

But the easiest test is to open the same clip in any CC 2015 version and see how Lumetri performs there. If it works then you can copy the Lumetri plug in to the CC 2017 or 2018 build and use it there without issue.

Rich Rubasch
Tilt Media Inc.
Video Production, Post, Studio Sound Stage
Founder/President/Editor/Designer/Animator
https://www.tiltmedia.com

[Greg Janza]

I wish I still had Adobe CC 2015 to experiment.

I haven’t noticed this issue at all on my system or on any of the other edit systems that I’ve worked on.

Is it possible that it’s actually more of a GPU related issue and not a Premiere bug?

Windows 10 Pro | i7-5820k CPU | NvidiaGeForceGTX970 | Blackmagic Decklink 4k Mini Monitor |
Adobe CC 2018 |Renders/cache: Samsung SSD 950 Pro x2 in Raid 0 | Media: Samsung SSD 960 PRO PCIe NVMe M.2 2280 | Media: OWC Thunderbay 4 x 2 Raid 0 mirrored with FreeFileSync