2 Correct answers
I went ahead and uninstalled and then reinstalled version 11.5 and the problem doesn't exist.
Just discovered this post (sorry apparently way behind on reacting to updated threads). I downloaded your image and your screenshots and indeed heavy posterization in your GPU on screenshot. I downloaded the nef and tried it on my Classic install (LR 12.2 on Mac Book Pro M1 Max running ventura 13.2.1) and it does not do the posterization with GPU on and I can very nicely see the stand leg in the lower left with the raw settings as in the screenshot, so it either is something in Monterey that was
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I completely agree with everything, but Lightroom is made for a wide population who may not be completely familiar with color management and various programs and... I still don't understand why it works OK in Lr 11.5 but not in Lr 12.2.
Apple says everything is fine with the GPU.
Apparently, if Capture One and Lr 11.5 work OK, there is something wrong with Lr 12.2 in connection with such a computer configuration.
Unfortunately, there is no other way to understand it.
By @tomazdeis
This has nothing to do with color management.
Apple is likely wrong, at least again, on my Mac, (MBP Pro 16" 2022 32-Core GPU | 16-Core Neural Engine/64GB), there is no banding or posterization in the image data. And you don't see it either in C1 so yeah, it's a preview issue likely due to GPU.
IF you disable GPU, do you see the posterization?
If I turn GPU off I see less postarisation but it is still visible. It is not quite the same as with Lr 11.5, where everything is OK. And Lr works slower.
By @tomazdeis
If turning OFF the GPU works, it's a GPU bug, and you need to contact the manufacturer or find out if there's an updated driver for it. This is why disabling GPU is an option as more and more functionality moves to the GPU in newer versions of many Adobe products.
I'm sorry, but if everything works OK in Lr 11.5, I don't understand it otherwise than that there is a problem here in Lr 12.2. By @tomazdeis
Due to the facts above, more functionality moves to the GPU in newer versions of many Adobe products and that's the case between these major versions.
For the sake of argument, let's say that this is an LR or PS (or fill in the blank), not a GPU bug. What to do?
File a bug report to Adobe:
https://community.adobe.com/t5/photoshop-ecosystem-bugs/how-do-i-write-a-bug-report/idi-p/12373403
Provide as much information about your system and hardware.
That wasn't done here.
Disable GPU. Again, very often, this fixes the primary issue. Yes, it slows down some operations, but that's better than a crash or freeze or maybe, in your case, posterization that isn't in your data. In my case, no posterization with your raw (different GPU or OS version, maybe that's it).
Roll back a version where it is possible this 'bug' isn't an issue (more likely, a feature hasn't been updated to run on a GPU).
If you wish to roll back to an older version, use the Creative Cloud application, click on the three dots (...) and select “Other Versions.”
And interestingly, Lr 11.5 with GPU auto matches perfectly with ACR 15.2 with GPU off and matches perfectly when exporting to PS.
Interesting!I hope the adobe techs are reading and they check and fix it!
By @tomazdeis
Your options were outlined.
Nothing else here will change that except (if you're so sure it is specifically a bug), you can file a bug report (which wasn't done here; hence, Adobe isn't paying attention). To do this, see below.
Photoshop:
https://community.adobe.com/t5/photoshop-ecosystem-bugs/how-do-i-write-a-bug-report/idi-p/12373403
Lightroom:
https://community.adobe.com/t5/lightroom-classic-bugs/how-do-i-write-a-bug-report/idi-p/12386373
Bug report template:
Issue:
- Photoshop version:
- OS:
Steps to reproduce:
Expected result:
Actual result:
To remind or inform those reading this, @simonsaith has his team looking into this as of Feb, 8th. Hopefully, there will be a solution soon.
By @DevinDahlgren
The solution is to disable the GPU (or get the GPU bug fixed).
Or downgrade to a version that wasn't updated to use the GPU for this processing.
Those of us without the GPU bug cannot reproduce this issue on newer versions.
Banding (posterization) can also appear on screen that isn't in the data but in the display path when users are not working with a fully high bit path (meaning display and video card as well as OS and application).
There's no banding visible even when cranking up exposure to uncover this under-exposed image, and viewed at 1:1 as it must be for an accurate preview:
I'm currently running LR 12.2 with GPU disabled until a fix is released or I upgrade to Ventura, which I have hesitated to do as of yet.
By @DevinDahlgren
GPU issues (bugs) on macOS are addressed in OS updates FWIW.
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