LR Lens Correction and/or Crop causing Grid Artifact in PS

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If I apply any of Lens Profile Correction or a crop in LR before editing in PS, a grid artifact is created when trying to make selections using channels. This also occurs if I use camera raw.
This appears to only happen on images that have been imported since I updated my adobe products in April (I am always behind).
For example if I edit a night image from 2018 or 2019 and go through the same process I do not get the grid effect. 
I have tested this on images (but only high iso night ones) from different camera bodies and brands as well as different lenses. 
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Monika Deviat

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Posted 2 months ago

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Rikk Flohr, Official Rep

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It would help us to know what Lightroom Version number you are using as well as the camera and lens models. 

If you could also supply your Lens Corrections settings used in the rendering of the image before sending to Photoshop it would help as well. 

One more question, if you bypass Lightroom and open the raw file with Camera Raw instead do you still see the issue?
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Todd Shaner, Champion

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When you apply a lens profile or any type of transform to an image with very high noise levels the noise distribution changes. This causes circular or pattern type banding in the image. The solution is to apply Luminance and Color noise reduction at 1:1 Zoom view to reduce the noise level. Also make sure to apply Sharpening conservatively and use the masking control to help reduce the noise level.

https://feedback.photoshop.com/photoshop_family/topics/circular-banding-in-shadows-with-lens-correct...

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Monika Deviat

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I noticed this initially with the newest LR 9.2.1. 
- As mentioned it does happen if using lens correction in Camera Raw.
- The grid artifact does not occur if I do not apply the lens correction and/or the crop.
- The gird artifact does not appear if I apply a profile correction only through PS and then go through the same processing steps.
- The grid artifact appears if I apply a crop but not the lens correction in LR.

If I use a previous version of LR with photos imported since I upgraded the grid artifact happens.
If I edit a night photo from 2019, 2018 etc, same camera and lens set up, the grid artifact does not appear even with profile corrections and cropping.

I have tested the following camera and lens combinations and they all show the grid artifact:
Nikon D810 + nikkor 14-24 f2.8
Nikon D850 + nikkor 14-24 f2.8
Nikon d810 + nikkor 24-70 f2.8
Nikon d850 + nikkor 24-70 f2.8
Canon EOS 6D + Tamron 15-20 f2.8


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Robert Somrak, Champion

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I tried one of you photos and did not see the patterns in Photoshop when using channels.  You need to upload a PSB file with your edits in Photoshop so we see exactly what edits you have applied in Photoshop.
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Monika Deviat

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I have uploaded two psd files to the drive folder above - let me know if the files work.
When I am using levels to adjust the duplicate of the red channel the grid is not seen. Once I hit okay, the grid is there.
 
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Robert Somrak, Champion

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I can duplicate the behavior you see.  As soon as I hit ok on the Levels Adjustment the pattern shows up.  I don't know what's happening but it is easy to duplicate.  
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Monika Deviat

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It's very strange. I was also editing some photos last night using smart objects to stack a series of images for noise reduction, and the flow I used caused the grid artifact again. But if I brought the images in without cropping, the gird artifact did not appear. I had not applied the lens correction in either case. 
I've done my editing the same way for years, and until I upgraded to the most recent version of LR and PS a couple of months ago, never encountered this.
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Todd Shaner, Champion

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After examining the four files you uploaded to Dropbox it appears the grid artifacts are due to shooting at high ISO 6400 and long exposure (15-20 sec.). The solution (and best practice!) is to view the original NEF file at 1:1 Zoom view and increase the Luminance slider to reduce visible noise. Adjust the other Noise Reduction panel controls as required to achieve the best results. Also be careful with the Sharpening settings, which may require some Masking and/or reduction of the Detail slider.

The mdeviat_correction applied_2018.dng file shot in 2018 has the default 25 Sharpening Amount applied, which was changed to 40 in LR 7.3. Because of this the mdeviat_correctionapplied_2020.dng shot in 2020 has the Sharpening Amount set to the new default 40 setting. This is enough of a difference to reveal a grid artifact pattern in the PS image file when a large Levels or Curves adjustment is applied.


The gird artifact is due to the camera sensor behavior, which for "normal" image processing is so small it's not visible. All cameras exhibit these small variations and I'm confident that applying proper Noise Reduction settings in LR BEFORE any further processing in PS should prevent them from appearing. Using the mdeviat_correctionapplied_2020.dng file with Luminance = 25 the grid artifact is NOT visible with your adjustments made in PS. As I mentioned above high ISO image files need to have proper Sharpening AND Noise Reduction applied to prevent these types of anomalies from appearing. Enjoy!