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

This might work for display issues (i.e. the Develop module), however, it doesn't seem to fix the issue of this occurring in exported files (for me at least).

THIS WORKED FOR ME 🤓

1) In LR Classic, go into Preferences

2) choose the Performance tab

3) change "Use Graphics Processor" to Custom

4) Uncheck "Use GPU for Display"

Note: any time you open LR Classic up again it's going to reminder you that the Graphics Processor isn't being used.  Don't turn it back on.

This fixed the proiblem for me and I want to thank this community for helping me fix a problem that was affecting my work!

The majority of this thread seems to be focused on this issue appearing in the Develop module. I'm having the exact same artifacts appear, but not when I'm editing in Lightroom - it only appears in the exported jpg files. Is anyone else experiencing this or have a suggested solution?

Again, everything looks fine in Lightroom. It is only the exported files that have the "clipping artifacts." This is obviously a huge issue that is majorly impacting my work.

I am using LrC 13.01 on a MACPro with Monterey.

During developement session I am getting in some cases rainbow color sections in pictures. Looks like area indication which are used for over lighted or underlighted. When exporting those pictures in black and white as well as colour this areas have also the same miss colour in the exported jpeg-pictures instead of correct black or white areas or coloured. The problem is, that I do not get the effect in every case 

A helping hand would be great

I'm experiencing the same issue: https://community.adobe.com/t5/lightroom-classic-bugs/multicolored-artifacts-appearing-in-shadows-of-exported-jpgs/idi-p/14254088.

I tried changing the process version under calibration, but my exported jpgs still have the artifacts. It's totally random though. If I keep re-exporting some photos won't have it and others will and then it changes again with each export.

This is only happening for me when I export with "Resize to Fit" checked off with 2048 pixels on the long edge selected. If I uncheck this option I don't experience the issue. The glitch appears to be in the compression process.

On my iMac 27", late 2014, macOS 11.7.10, the image renders correctly only moving back to PV4; the move back to PV5 has no effect.

I upgraded Lr from 12.3 to 12.5.1, reopened the catalogue, selected a photo with dark areas and switched to the develop module.  At this point it has rendering problems.  It was already on PV5.

This isn't quite what you asked, but does it give you the info you are looking for?  Or, would you prefer it if I take this photo and add it to a new catalogue where it will automatically be PV6, try to reproduce the problem and then follow your steps?

… exactly what is happening in my case. thanks for your support, Community!

If you edit your photo, and the odd pixels are present, scroll down to the Calibration Panel and change the Process Version from 6 (Current) to PV 5. Do not touch any edit controls. Does your image now render correctly? (Note: you may have to zoom in and out once to force a rerender. Moving to the next image in the filmstrip should accomplish the same refresh.) Please respond directly to this post if your image does render correctly after changing the PV.