Severe Image Artifacts in Lr Library Module

Question

I am getting severe image artifacts mostly in the sky in the library module of Lightroom Classic. I am using version 13.2 but this is not the first time I have seen this. It goes away in the develop module or if I view at 100%. After viewing the image at 100% looks OK when fit to screen. It also looks OK if I build 1:1 previews. When I import I only build smart previews. This is extremely annoying and is occurring on multiple RAW images. Once I export to a jpg it looks OK. The attached image was taken with a screen capture program. As you can see it is really bad. I see other post about this subject but the are all old back in 2018. I have been using LR Classic for many years and this only showed up reciently. I am on Windows 10 64 bit.

johnrellis · Accepted Answer

"When I import I only build smart previews." Others have reported artifacts and banding in smooth-gradient skies with both Library standard previews and in smart previews (both of which are 8 bits/channel), with the artifacts and banding disappearing when you export to 8-bit JPEGs. LR is using an inferior algorithm for generating these 8-bit previews.   For example, see this bug report:https://feedback.photoshop.com/conversations/lightroom-classic/photos-show-banding-when-viewed-in-the-cloud-but-not-in-lightroom-classic/605cd28bc7571a4888e303c4  Experimenting with the sample DNG in that bug report, I see the sky banding in both Library standard previews and smart previews. I think your only workaround is to generate 1:1 previews on import. Consider setting Catalog Settings > Automatically Discard 1:1 Previews: After One Week or Day if the disk size of the preview cache is a concern. Please add your constructive opinion to the bug report, and be sure to click Like and Follow at the bottom of the first post. That will make it a little more likely that Adobe will prioritize a fix, and you'll be notified when the bug's status changes. Product developers rarely participate in this forum and won't see your feedback.  Be sure to upload an original sample photo to Dropbox or similar and include the sharing link in that bug report.

TheDigitalDog · Answer

First, try disabling GPU in the preferences (Preformance tab). Any better?
If not, recalibrate and build a new ICC display profile, the old one might be corrupted.
If you are using software/hardware for this task, be sure the software is set to build a matrix not LUT profile, Version 2 not Version 4 profile.
If turning OFF 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.
Also see: https://helpx.adobe.com/photoshop/kb/acr-gpu-faq.html

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