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Huge block visible (horizontal + vertical line) : after using Denoise AI and Remove (AI) tools

Forum|Forum|26 days ago
July 9, 2026
17 replies
131 views

See horizontal and vertical line on right. half of the picture

The artifacts (lines) became visible in a part of the pictured that I repaired with the Remove - Generative AI tool. The artefact only appears if Denoise AI is applied as well.
Disabling one of them, makes the artefact dissapear.
No other edits applied.
Camera is Sony RX10iii, cRAW (.ARW file).
Lightroom version 15.4.1
macOS Tahoe 26.5.2

Correct answer johnrellis

[View this post in your web browser. It contains formatting and images that don't appear in email.]

Opening the catalog you shared, I don’t see the artifacts in my LR 15.4.1 / Mac OS 26.4.1. (See screenshot below.)

I tried deleting the .lrcat-data file that stores the result of the AI commands, forcing them to be re-evaluated, and the artifacts didn’t appear.

If in the test catalog you reset settings and then try to apply just Denoise and Remove, without the other steps shown in the History panel, does the problem reoccur? I’m wondering if it’s related to the particular sequence of commands shown in the History panel.

Unfortunately, if we can’t identify a way to reproduce this or share a catalog/photo showing the problem, Adobe isn’t likely to pay much attention.

T

TabsAZ

Participant

I’m seeing this as well after AI denoise without even using generative remove at all. Canon R5 II in uncompressed RAW. The vertical blocks/lines are there in the exported JPG as well, so I don’t think it has anything to do with previews as someone else was theorizing. Clearly goes away with Denoise unchecked.

R

rudolfl27731976Author

Known Participant

Can you please share a screenshot of your (entire) picture?
There are reports about a block effect (lines / raster visible, but faint and rather large in size) after applying denoise on Apple / M-series machine + a large amount of Dehaze applied.
Are those two conditions met - for you ?

T

TabsAZ

Participant

Yes, exactly that in fact - I’m on an M2 Max Macbook Pro 16 and this photo does have significant dehaze applied. It’s a telephoto shot of Mt. Rainier from about 100 miles away, so needed a lot of it.

Jason Miller234

Participating Frequently

It looks like a bug between Generative Remove and AI Denoise. Try running AI Denoise first, then apply Generative Remove. If the lines still appear only when both are used, report it to Adobe with the RAW file—it will help them reproduce and fix the issue.

johnrellis

Legend

[View this post in your web browser. It contains formatting and images that don't appear in email.]

@Jason Miller234 Try running AI Denoise first, then apply Generative Remove. If the lines still appear only when both are used, report it to Adobe with the RAW file—it will help them reproduce and fix the issue.

Elsewhere in this thread, @rudolfl27731976 provided the original raw, and neither he nor I were able to reproduce the issue, applying the operations in either order. See his reply elsewhere here about his hypothese of what’s going wrong.

johnrellisCorrect answer

Legend

[View this post in your web browser. It contains formatting and images that don't appear in email.]

Opening the catalog you shared, I don’t see the artifacts in my LR 15.4.1 / Mac OS 26.4.1. (See screenshot below.)

I tried deleting the .lrcat-data file that stores the result of the AI commands, forcing them to be re-evaluated, and the artifacts didn’t appear.

If in the test catalog you reset settings and then try to apply just Denoise and Remove, without the other steps shown in the History panel, does the problem reoccur? I’m wondering if it’s related to the particular sequence of commands shown in the History panel.

Unfortunately, if we can’t identify a way to reproduce this or share a catalog/photo showing the problem, Adobe isn’t likely to pay much attention.

R

rudolfl27731976Author

Known Participant

Hi John, thank you for verifying and giving suggestions.

Right after I opened the catalog file I shared, I saw the effect.
However - when I changed to the edit mode the artefact disappeared → Set me thinking has it anything to do with the previews/cache only?

I opened my original catalog and saw the effect again.
I build a 1:1 preview, and it gone.
Can’t reproduce it anymore, so I assume it was a quirk in the preview.
Thanks for getting this sorted.

johnrellis

Legend

Glad you got it resolved. Though it’s mildly disconcerting the artifacts ever appeared.

johnrellis

Legend

Are you on an Intel Mac? If so, please do the LR menu command Help > System Info, click the Copy button in the upper right corner, and paste into your reply here, so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.

If you’re not on an Intel Mac, please attach the original raw here and we can see if the issue occurs on other installations, narrowing down whether this is a problem with LR’s handling of the image or a problem specific to your installation.

R

rudolfl27731976Author

Known Participant

Hi John,

I should have mentioned my computer type.
MacStudio M4 max, 16/40 cores, 64GB 2TB

RAW file + edits exported as catalog and attached as zip.
Thank you for looking into this.

rvdl-65148.zip

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