Tip for shirt pattern moire

I had to edit something where the speaker had a very fine checked shirt. So small I couldn't make out the pattern, but it showed up as horrible moire. I tried all kinds of things in Color... I looked at it in R/G/B and Y/U/V and the moire was in every channel. (So I couldn't do something like blur U and V but leave Y alone.)

I tried adjusting midtone detail and blurring. I tried the blur and sharpen OFX filter that lets you adjust small, medium, and large textures. (Forgot to try the Advanced mode of Texture Pop, but I think the moire was baked-in in the camera and not just a near-moire that I could fix by finding the right frequency.) I tried pretty much everything I could think of and finally decided I was just going to go down the OFX filter list (in Color) to see if anything might work.

Finally, I hit upon the Deband OFX filter and it worked pretty amazingly! It got rid of 90% of the moire while maintaining most of the details of the shirt, including crinkles in the sleeves, the placket and buttons, etc. There were definitely some areas around the edges that had a bit of an out-of-focus look, but I was absolutely amazed.

I made a qualifier for the (blue) shirt, applied Deband, and dialed in some negative midtone detail and it was definitely watchable afterwards. (Deband is Studio-only.) Hope someone else finds that helpful.

I haven't used Deband for this particular problem, but I have used Y-only SNR with a tracking window on the offending moire pattern. I wish filmmakers would shoot costume and makeup tests more often, because if they did they'd immediately see these problems and fix them prior to the start of production. Minus-Midband might help a bit as well, but I'd probably combine that with a key qualified to the specific striped patterns and a tracking mask.

Eager to try that out.

Back in my BMCC days I had to come up with a way to deal with awful moire.

Have a look at this thread,

viewtopic.php?f=22&t=45371

A bit more work, but it was very effective.