P: Colored "pixel" artifacts/subdued blacks in shadow areas (older Macs) (also visible on CR)

@shywolfphotography, you can try setting Preferences > Performance > Use Graphics Processor to Off, which works for some but doesn't work for others.  If that doesn't help, the only other workaround is to roll back to LR 12.3.

It does appear on exported images. I am not able to currently work due to this - is there a fix other than buying a whole new system?!!!

BTW, I have tried turning off the graffics processor. I am now going to try rolling back. Thanks to evreyone for the responses.

I have recently upgraded to LrC 13.0.1 with Camera Raw 16.0. Since then I have had all my darker images export with serious noise and banding issues. I ended up migrating my catalog to LR and exporting from there with no issues. I can't keep doing it though, our workflow is from LrC. Any ideas?? I'm attaching the files from LRC and the ones from LR for reference.

@eadkins, see here:

https://community.adobe.com/t5/lightroom-classic-bugs/p-artifacts-resembling-clipping-warnings-odd-bright-colored-pixels-in-shadow-areas-older-macs/idc-p/14216239#M48828

@TheMatia  "Metal: AMD Radeon HD - FirePro D300"

@bgranofsky "AMD Radeon R9 M370X 2 GB"

Yeah, these are previously reported problem children, thanks for confirming. 

I have an image that was shot in low light with some dark shadow areas. The shadow clipping is turned off but the blue areas are still appearing. This also appears on the image when exported.

*ive covered the image for privacy

thank you, this is what I am running.

Hi @johnrellis thanks for the reply and merge. You're right, I have a very old Mac Pro at work - details below copied from LR system info. I've turned off graphics processor and restarted LR which has currently fixed the exports. WOOHOO, thanks again John for the current fix.

Lightroom Classic version: 13.0.1 [ 202310121438-d2af310c ]
License: Creative Cloud
Language setting: en-GB
Operating system: Mac OS 12
Version: 12.6.5 [21G531]
Application architecture: x64
Logical processor count: 8
Processor speed: 3.7GHz
SqLite Version: 3.36.0
Built-in memory: 12,288.0 MB
Real memory available to Lightroom: 12,288.0 MB
Real memory used by Lightroom: 507.4 MB (4.1%)
Virtual memory used by Lightroom: 42,025.0 MB
Memory cache size: 965.0MB
Internal Camera Raw version: 16.0 [ 1677 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX
Camera Raw virtual memory: 710MB / 6143MB (11%)
Camera Raw real memory: 875MB / 12288MB (7%)
Standard Preview Size: 2560 pixels
Displays: 1) 1680x1050, 2) 2560x1600

Graphics Processor Info:
Metal: AMD Radeon HD - FirePro D300
Init State: GPU for Image Processing supported by default with custom export support
User Preference: Auto

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Users/*me*/Pictures/Lightroom/Lightroom Catalog-v13.lrcat
Settings Folder: /Users/*me*/Library/Application Support/Adobe/Lightroom

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

Config.lua flags: None