Lightroom Classic 9.1: Cyan/light blue pixels showing up when making dark local adjustment

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  • Problem
  • Updated 7 months ago
  • (Edited)
Just as stated in the title, they show up on dark background when using a dark radial filter or gradient (-100 highlights, -100shadows and -4 exposure) especially if the feather is low. The pixels are visible even with the shadows clipping warning and are not visible in monochrome images (clicking V). They are visible at any zoom value as they are part of the image but the exported image does not present them. See attached screenshots.

System Datas:
MacBook Pro (16-inch, 2019)
2,4 GHz Intel Core i9 8 core
64 GB 2667 MHz DDR4
AMD Radeon Pro 5500M 8 GB
macOS Catalina 10.15.2 (19C57)
Lightroom Classic 9.1

 
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alfeel

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Posted 7 months ago

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Johan Elzenga, Champion

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If they do not show in the exported image, then most likely this is a video card issue. Try if the problem goes away if you disable GPU acceleration in Preferences - Performance.
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alfeel

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It does go away if GPU acceleration is disabled, but is it possible to have a bug fix?
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Todd Shaner, Champion

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using a dark radial filter or gradient (-100 highlights, -100shadows and -4 exposure)
The extreme -100 Highlights coupled with the backwards -100 shadows may be causing the issue. If your objective is to make the selected area totally black use a single setting of -4.00 Exposure and then right-click on the Radial or Graduated filter pin and select 'Duplicate.' You can apply the filter "Duplicate' function multiple times, which are cumulative. This may remove the spot artifacts and is a better way to accomplish your objective.