P: Thick red/blue banding in brightened shadows of Denoised DNGs

[PvlKnn]

I noticed this a few days ago but didn't realize the scale of the issue until I played around with the Exposure values and tested them to the limit.

I've attached two screenshots of the Develop module. The control image is an RAF photo with Exposure boosted to +5. The experiment is a DNG derived from the RAF, with a Denoise amount of 30. The effect manifests at all amounts from 1 to 100. However, the banding is not present in the Enhance Preview window. I have also attached the original Fujifilm RAF from my X-H2s camera (lossless compressed) and an affected DNG with Denoise.

I can't detect this phenomenon in NR conversions before LrC 13.3. 

The significance should be self-evident. The banding artifacts appear in images with lifted shadows or underexposed photos with boosted brightness.

Lightroom Classic version: 13.3.1 [ 202405311538-6d7c0308 ]
License: Creative Cloud
Language setting: en-CA
Operating system: Mac OS 14
Version: 14.5.0 [23F79]
Application architecture: arm64
Logical processor count: 12
Processor speed: NA
SqLite Version: 3.36.0
Power Source: Plugged In, 80%
Built-in memory: 32,768.0 MB
Dedicated GPU memory used by Lightroom: 5,764.7MB / 21,845.3MB (26%)
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 3,716.8 MB (11.3%)
Virtual memory used by Lightroom: 424,322.1 MB
Memory cache size: 1,238.0MB
Internal Camera Raw version: 16.3.1 [ 1889 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 2281MB / 16383MB (13%)
Camera Raw real memory: 2285MB / 32768MB (6%)

[Ross2511000501vd]

Hi, have used denoise AI regularly however, today, I used as normal and have noticed X2 purple bands appearing on the denoise DNG. These are not visible on the original files. I have attached screenshots of original RAF file and enhanced DNG

System used:

Macbook Pro 2022, M2 chip, Sonoma 14.5, Lightroom 7.4.1

Camera:

Fuji XH2, Sigma 18-50mm 

I note that this seems to have been a problem previously but I cannot see that it has been resolved. Look forward to hearing from you soonest.

Ross

[robertleephoto-cc]

 When trying to Denoise photos using the ai tool in Lightroom classic on my new Apple M3 Max MacBook Pro, I found that it processes the photo really fast compared to my older MacBook.. but leaves a checkerboard like color error on the processed image. I've never seen anything like it and tried to disable GPU in settings to see if anything changes and it made no difference. I take nightclub photos so being able to use the denoise tool is incredibly important to me. I thought maybe it was my camera or lens I used that night so I opened the catalog on my older MacBook (2018 2.9ghz 6 core intel i9 w/ Radeon pro Vega 20 4gb) and there was no checkerboard across the exact same photo when processing it. What could be causing this? My new laptop is under warranty, should I have it replaced? 

[robertleephoto-cc]

image from m3 max 

[Ian Lyons]

The image wasn't attached. You need to use the icon on toolbar that looks like a mountain.

In the meantime, can you confirm whether the issue you're seeing is similar to that shown in below linked thread.  Given that your computer is Apple silicon rather than Intel with AMD GPU, it shouldn't be, but...

https://community.adobe.com/t5/camera-raw-bugs/p-denoise-large-artifacts-with-amd-graphics-card/idi-...

[John R Ellis]

Upload a problem raw and the denoised .dng to Dropbox, Google Drive, or similar and post the sharing link here. We can see if the issue is inherent in the photo itself when denoised on other Apple Silicon devices or is specific to something on your computer.

[John R Ellis]

Also, please do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.

[robertleephoto-cc]

Okay great here is a link to the photos, one is exported on my old MacBook, and the other is from my newer MacBook:

https://www.dropbox.com/scl/fo/phok2wdsmyun7arscg226/AD3-fu-ce9o5bPhakuax5gI?rlkey=5loqf8et5r8bkg362...

[robertleephoto-cc]

Here is a link to both files, one from my older computer and one from my newer one:

https://www.dropbox.com/scl/fo/phok2wdsmyun7arscg226/AD3-fu-ce9o5bPhakuax5gI?rlkey=5loqf8et5r8bkg362...

[John R Ellis]

Please upload the original raw as well (DSCF1729.RAF). That will let us test whether the denoise issue occurs on other Apple Silicon computers or is something specific to yours.

[robertleephoto-cc]

ok I added the raw file to that same folder, I used this image as an example as it required some heavy denoise from the program.. although every file from the last few shoots have the same issue and my old computer can denoise without any issues. 

[robertleephoto-cc]

Lightroom Classic version: 13.5 [ 202408062022-6258095b ]
License: Creative Cloud
Language setting: en-US
Operating system: Mac OS 14
Version: 14.4.0 [23E214]
Application architecture: arm64
Logical processor count: 16
Processor speed: NA
SqLite Version: 3.36.0
Power Source: Battery, 100%
Built-in memory: 49,152.0 MB
Dedicated GPU memory used by Lightroom: 3,802.2MB / 36,864.0MB (10%)
Real memory available to Lightroom: 49,152.0 MB
Real memory used by Lightroom: 3,164.2 MB (6.4%)
Virtual memory used by Lightroom: 411,135.1 MB
Memory cache size: 68.2MB
Internal Camera Raw version: 16.5 [ 1953 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 983MB / 24575MB (4%)
Camera Raw real memory: 1016MB / 49152MB (2%)

Cache1:
Final1- RAM:203.0MB, VRAM:0.0MB, DSCF1729-Enhanced-NR.dng
Preview2- RAM:22.0MB, VRAM:0.0MB, DSCF1720.RAF
Final3- RAM:511.0MB, VRAM:1,914.0MB, DSCF1729-Enhanced-NR-2.dng
Preview4- RAM:22.0MB, VRAM:0.0MB, DSCF1701.RAF
Preview5- RAM:22.0MB, VRAM:0.0MB, DSCF1730.RAF
Preview6- RAM:22.0MB, VRAM:0.0MB, DSCF1703.RAF
Preview7- RAM:22.0MB, VRAM:0.0MB, DSCF1738.RAF
Preview8- RAM:22.0MB, VRAM:0.0MB, DSCF1733.RAF
Preview9- RAM:22.0MB, VRAM:0.0MB, DSCF1698.RAF
Preview10- RAM:22.0MB, VRAM:0.0MB, DSCF1729.RAF
Final11- RAM:203.0MB, VRAM:0.0MB, DSCF1726.RAF
NT- RAM:1,093.0MB, VRAM:1,914.0MB, Combined:3,007.0MB

Cache2:
m:68.2MB, n:788.9MB

U-main: 73.0MB

Standard Preview Size: 3456 pixels
Displays: 1) 3456x2234

Graphics Processor Info:
Metal: Apple M3 Max
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: OFF

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Volumes/Extreme SSD/Provincetown Business Guild 2024/Carnival Week Events/Closing Party Crown and Anchor/Closing Party Crown and Anchor.lrcat
Settings Folder: /Users/robertbardelmeier/Library/Application Support/Adobe/Lightroom

Installed Plugins:
1) AdobeStock
2) Aperture/iPhoto Importer Plug-in
3) Flickr
4) Nikon Tether Plugin

Config.lua flags:

[John R Ellis]

I see the same problem applying Denoise to your sample raw on my Apple M2 Max:

The photo was taken with a Fujifilm X-H2S, and Adobe has acknowledged a bug with Denoise and raws from that camera. I'm not aware of anyone posting a workaround, unfortunately.

[John R Ellis]

Moderators, @Rikk Flohr: Photography, please merge with the existing bug:

https://community.adobe.com/t5/lightroom-classic-bugs/p-thick-red-blue-banding-in-brightened-shadows...

[robertleephoto-cc]

That's awful... basically means my new computer isn't worth the upgrade and I should just continue using my old MacBook that was released before the M chips. I hope this bug is able to be resolved 

[riccimar]

i sometime have problems of 'ghost' images prodced by enhance photo function with RAF files (i use a Fujifilm X-H2) you can clearly see the problem processing this underexposed image from DPReview.

Lightroom 13.5, SOnoma 14.6.1 on M1 Macbook pro

.

enhanced photo:

and the standard result:

[GoldingD]

Did you accomplish any develop edits at all before attempting the Enhance?

[riccimar]

No, it's just overexposed in LR by several ev, original pic is much darker. 

Here the file https://www.dpreview.com/reviews/image-comparison/download-image?s3Key=50267c8770574a21bedcd6143dd65...

[GoldingD]

Ok, I downloaded your sample, and imported it into my test catalog

BIG IMPORTANT NOTE: My rig Windows 11 PC and NVIDIA GPU. Not MACOS

I would like to point out that I made sure I was not applying any presets at import:

First thing I notice is that the image on my screen does not look at all like in your posting

You may notice that no edits appear in the Basic panel. And that the image is very underexposed. And not at all like your previous. This implies that you are making some edits in post processing prior to the Enhance. Perhaps a preset in import? Perhaps your /Preferences/Presets/Raw Defaults / ?? Or you did up the exposure some.

For a reference, below is my /preferences/presets/ during this test

For the Enhance, I just went with my current default

and the resultant image:

Bringing up a Reference view, two instances, first with the Enhanced selected as active, original as reference, then the other way around, this allows a simple way to compare the Histograms as well as the overall appearance 

Now having looked at all that, a question may arise, what if I accomplish some tonality changes. Do the two files look the same. For this I used a plugin, Jeffrey Friedl's “Bag-o-Goodies” Plugin, specifically the Personalized Auto Tone, in where I limit Auto Tone to just Exposure, Whites and Blacks.

Again the Reference views

But of course the data is not the same, one RAF from camera, the other a DNG via Enhance.

[riccimar]

the test is really really simple, you download the file i linked from DPR, as i said is an underexposed photo (it's used for latitude test/shadow recovery). i don't apply any setting or preset. you convert the RAF in DNG, you add later +5EV to check the shadow recovery ability. the RAF looks fine, the DNG is broken with red patches

i am not talking about colored noise, but about the large red rectangles apparent in the DNG

broken DNG

here you can see the comparison DNG vs original RAF (both at +5EV)

DNG VS RAF

I suspect a bug with the M1 GPU or maybe Sonoma 

[GoldingD]

Ok, I see this has now been merged into another Bug posting. So at this point hope Adobe will fix. When? (not a clue)

Also I added as a note in my previous reply that my rig is Windows 11 NVIDIA GPU so not a MAC.

[calm_Rose5E92]

Hello everyone, I am having a strange issue with my photos that I have used denoise on. I am getting these lines across the screen, yet these are not in my raws and only the images that I have used denoise on. 

I am editing on a Macbook pro M2 and shooting with a fuji x-h2 (this is my first shoot with this cam). 

Is this a sensor issue or a lightroom bug? Is there a fix? 

[calm_Rose5E92]

For reference, this is the RAW image with the exposure maxed out to show the lack of the lines. 

[John R Ellis]

@calm_Rose5E92: "I am having a strange issue with my photos that I have used denoise on. I am getting these lines across the screen, yet these are not in my raws and only the images that I have used denoise on. I am editing on a Macbook pro M2 and shooting with a fuji x-h2 (this is my first shoot with this cam). "

As you can see earlier in the thread, Adobe has acknowledged this bug with Denoise on Fujifilm X-H2. Unfortunately, they rarely indicate when/if a bug will be fixed, so you'll just have to wait.

[PvlKnn]

I'd like to point out this isn't a bug exclusive to the X-H2 (I reported it initially after discovering on my X-H2s and confirming it on old photos taken with my X-T2). I've tested it on other Fujifilm raw files and the problem appears universal to every camera with X-Trans sensors. Given Adobe's indifference to good rendering of that colour filter array, I have low hopes of this issue being addressed with any priority, if at all. 

[calm_Rose5E92]

Have they given any indication of how long until they fix the issue? or is there any work around like using an older update of LRC?