When odd stripes and patterns appear in your images, this is called a moiré effect. This visual perception occurs when a fine pattern on your subject meshes with the pattern on the imaging chip of your camera, and you see a third separate pattern. (This happens to me a lot when I take a photo of my laptop screen).
Because fewer cameras are now equipped with an anti-aliasing filter (they slightly blurred the photo and who wants a blurry photo?), you’ll see the moiré effect occurring more often these days, especially as a portrait or architectural photographer.
So, what causes the moiré effect, how can you spot it while you are shooting, and how can you avoid it? How do you fix it in post? In the following 11 minute video from Adorama TV, Gavin Hoey answers these questions about moiré as part of his Take and Make Great Photography series. As Gavin explains the moiré effect, when you combine the patterns in just the “right way, you’ll see a rainbowing or circular pattern” in your image.
To avoid it altogether, Gavin recommends you take a test shot, then zoom in to make sure you aren’t getting the effect. Gavin then gives three solutions to get rid of moiré if you happen to spot it in your image. But what happens if you miss it until you sit down in post? Gavin has a simple Photoshop/Lightroom fix. Watch the video below get his tips so you never have to deal with moiré in your images again.