Moire pattern on wall

Question

I recently did finishing work on some files of a hotel for one of my clients. On a few of the walls appeared what looks like a moire pattern in the processed images. I use Lightroom for processing prior to retouching the files. This pattern doesn't show up in the original JPEG files sent to me by the client. I have no idea what created this pattern. I didn't do anything different than usual in my processing. Any thoughts or suggestions are appreciated. See attached photos.

donp30872227 · Accepted Answer

Yes, the specific step that created this pattern is called a "Defog" action from another photographer. Spcifically it's unsharp mask, amount 20%, Radius 40 pixels, Threshold 0. These files are created by HDR and often appear to have a bit of haze or flair. This was supposed to reduce that effect but it unfortunately caused the banding issue. Thank you for your comment.

D Fosse · Answer

To me this looks like banding, not moire. Banding happens in 8 in color depth, and the jpeg format is partucularly susceptible because the jpeg algorithm compresses the color component much more aggressively than the luminance component.

If you need to do further work on a jpeg, resave it as a 16 bit PSD or TIFF immediately.

Even better, ask your clients for TIFFs or PSDs to begin with.

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