Lightroom Classic: Default color noise reduction on merged HDR files causing color desaturation

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  • Updated 1 month ago
  • (Edited)
Lightroom is setting the color noise reduction to 25 on final HDR merged files and this is causing high color desaturation. It seems this feature put too weight on those type of files.HDR File with default settings (Look at red halo at the top):HDR File with color noise zeroed:One of HDR's source RAW file:I also checked with 32bit HDR TIFF files, putting the same value for color noise, and the result is the same.I'm using LR CC 2015.1.1
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Rodrigo Tozzi

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Posted 3 years ago

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Photo of Todd Shaner

Todd Shaner, Champion

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This behavior still exists in LR Classic 7.3 and ACR 10.3 Photo Merge to HDR DNG files and PS Merge to HDR Pro TIFF files. It's quite surprising that there have been very few reports other than complaints of "lackluster" results, which may be due in part to this issue! Is anyone else seeing desaturation of red objects in their ACR, LR or PS HDR files when applying Color Noise Reduction? If so please add your Me To vote up top.
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Do you guys have a set of images that exhibits this dramatic of a shift? The pano/merge engineer was not able to reproduce what you're seeing and is wondering if it's image specific.
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Todd Shaner, Champion

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Jeff, when Color NR is applied to a LR HDR DNG file or a PS created HDR TIFF file it desaturates objects that are RED in color. The LR default Color NR Amount setting is 25 and when applied to the HDR DNG file it causes noticeable RED desaturation. The same happens with a PS created HDR TIFF file. The OP's example has a RED object that desaturates similar to the example I've uploaded to Dropbox. I've included both LR and PS created HDR files. I'm using LR 7.2 and PS 19.1.3 on a Windows 7 SP1 system. Here's a link to the folder. Let me know if you need anything else.

https://www.dropbox.com/sh/v0ph4ag9jpwpbao/AABQuZvpIb30bT_mVpxryBena?dl=0