I was editing some events photos and started noticed a strange pattern with low light files, and with the Lens Correction feature activated. I increase the exp so you can see better the lines. ISO 6400. Check the file
posted there as well, idk why adobe use confusing names in forum. at least product name should be lightroom cloud however it is adobe photoshope lightroom in reality.
The names are indeed confusing. The metadata in "after.jpg" says it was generated by Lightroom 7.1.2 (Windows), which is Lightroom Desktop, part of the "Lightroom ecoystem". Adobe never uses "Adobe Photoshop" to prefix the various names of Lightroom in these forums, even though that's what Help > About Lightroom says.
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As expected, I see the same effect using LR Classic 13.1 and CR 16.1 with the attached .arw, using the develop settings in "after.jpg". (I extracted the Develop settings used in "after.jpg" to _DSC0041.xmp, attached). But the pattern is clearly visible with just Exposure = 2.5 and Enable Profile Corrections:
I've seen this discussed elsewhere, but not with this particular behavior. On certain high-ISO shots, my Fuji X-T5 RAF files show a distinct warped-grid pattern that corresponds to the lens profile correction being applied. Turning off profile correction makes the grid disappear, leaving me with the lens' native distortions visible. Using manual correction makes the grid reappear. The "enhance" function doesn't fix it. DNG files imported from Photolab or Iridient show the same effect. Sharpening or use of texture or clarity sliders makes it worse. Based on posts I've read in various forums, this issue is not unique to Lightroom's handling of Fuji files.
If I send the file to Photoshop, save it as a TIF, and then reopen it in Lightroom, the grid pattern is gone. This workaround is not ideal, adding yet another step and file in addition to the orginal RAF and the enhanced-details DNG. This looks like a bug to me and I'm curious if someone can explain what's going on.
I've attached two screenshots, using ALT+Mask to emphasize the pattern. The first is the RAF file viewed in Lightroom. The second is the same file after being returned from Photoshop as a TIF.
After a little further experimentation, it doesn't seem like there's a way to completely eliminate this pattern without disabling lens profile corrections, but it is possible to reduce it to the point where it's nearly invisible, short of the most extreme manipulations. Aside from opening the file in Photoshop and sending back as a TIF, both the Iridient plug-in (for X-Trans files) and DXO Photolab do a far better job of applying their built-in corrections without the warped grid being obvious. Just remember (as I did not initially) to turn off profile corrections in Lightroom, or you'll get that on top of the corrections already applied. When sharpening, turning down the details slider and turning up radius and masking also helps.
The culprit here is clearly Camera Raw and the way it's implementing the Adobe lens profiles.
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