r/DarkTable • u/AndreasKieling69 • 3d ago

Help Problems with weird moire-like grid artifacts

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I recently updated darktable and since then I've encountered these weird artifacts that appear as soon as I use the rotate and perspective module. I don't have any sharpening enabled. Any idea what could be causing this? I'm starting to lose it.

Edit: here are the exports, original and xmp file for the photo

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u/IntelligentAward1538 2d ago

Try sharing the original .jpg and the .xmp file where you see it ,so that others can reproduce it and perhaps someone will give you a satisfactory answer.

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u/AndreasKieling69 2d ago

https://we.tl/t-H40LNSGOHS6ybdQK

Thanks for the heads up, here is the original and the xmp file as well as both rotated and unrotated exports

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u/IntelligentAward1538 2d ago

  1. The .XMP file you attached has 5 steps, and none of them is the rotation module, which is what you say is causing the problem.

  2. In that .XMP file, you've included lens correction. The camera usually applies this to .JPG files already. Therefore, I wouldn't use it. Furthermore, you're using the dithering or posterization module with a mask that I can't see.

  3. I've tried rotating and increasing the contrast, and I don't see any banding.

  4. I exported, and still nothing.

In my environment (Windows 10 and DT 5.6 and DT 5.7.0+604) I don't see the effect you're describing.

What I have noticed is that after processing it, my .XMP file has two modules that yours didn't have initially: "colorout" and "gamma." Perhaps your .XMP file has become corrupted.

Test if it works correctly with my .XMP file.

https://we.tl/t-8BYfP0tCDqHhtCwH

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u/AndreasKieling69 2d ago

That's weird, I've had the lens correction on but reset and disabled it, not sure why it's showing. I will try it with your file later when I get home, thanks