Getting blocks of dead pixels after denoise

Question

Hi. The Denoise function is life changing for me and I use it for all photos ISO 4000 and above. Now I shoot even ISO 51200 and I have no problem with that because I know the photos will look great. But I have a problem. Every now and then I get blocks of dead pixels on photos, but different all the time. It can be 1 out of 100 or 2 out of 20. But usually is about 1 or 2% of the photos. I do the Denoise operation for a number of maximum 120 pictures at a time. I tried more, but every time Lightroom crashed. I happened even when I did Denoise for only one photo. If I do the Denoise again on the original photos, it will work just find. Do you have any idea why this can happen?

I use a Mac 3.8 GHz 8-Core, AMD Radeon Pro 5500 XT 8 GB, 16 GB 2667 HMz DDR4 with latest updates. It worked perfectly for like 6 months and just after that the problem started.

Ian Lyons · Answer

There are numerous others post highlighting issues with AMD Radeon Pro GPU's. Below is a link to a thread where the 5500m is involved. The suspicion is that the macOS GPU drivers for these particular GPUs is bugged, but since Apple have a monoply on the drivers there's no way to change them. The 5500M also tends to run extremely hot causing the fans to run at or near max, espcially when using Denoise. Some users have reported that vacuuming the ventilation ports helps clear any debris resticting air movement. It might be worth giving this a try.

https://community.adobe.com/t5/lightroom-classic-discussions/p-artifacts-on-all-photos/td-p/14563606

Sign up

To post, reply, or follow discussions, please sign in with your Adobe ID.

Sign in to Adobe Community

To post, reply, or follow discussions, please sign in with your Adobe ID.

Scanning file for viruses.

This file cannot be downloaded