![]() If you are a Nikon shooter, you ca set the multi-selector center button on the back of the camera to instantly show 100% view without having to press the zoom button several times. Quick Tip: if you own an advanced DSLR or mirrorless camera, you should be able to use a single button to jump to 100% view when playing back images (see your camera manual). If you see moiré and want to avoid it, proceed to step #2 below. Unfortunately, using zoom levels other than 100% can produce moiré due to resampling alone, so you will need to view images at pixel level. Looking at the thumbnail on the LCD might not reveal moiré, so you will have to zoom in to see it. ![]() Analyze your images on your camera’s LCD at 100% view – while looking at your images on the camera LCD at 100% view can be very inefficient and time-consuming (especially on cameras with a lot of resolution), if you are shooting anything with repeating patterns, you need to know whether there is moiré in your images or not.Below you will find a list of steps you can take to avoid moiré while shooting fine detail: How to Avoid MoiréĪs you will see below, moiré can be quite painful to deal with in post-processing, so it is best to avoid it in camera. Therefore, it is best to address the issue at the time of capture whenever possible. While there are methods to effectively reduce moiré (which we discuss below), there is no easy way to completely remove it in post-processing software. Here is a comparison of the optical low-pass filter between the two cameras: For example, the original Nikon D800 had the blur filter, while the D800E did not. Some camera manufacturers even started providing two different versions of cameras to give both options. This would potentially re-introduce moiré in some images with extreme detail, but for specialized photographers who rarely encounter fine detail, it would not be a problem. Camera manufacturers realized that they can provide increased level of detail for those who need it by eliminating the “blur” filter. As the number of pixels dramatically increased, chances of seeing moiré patterns also somewhat decreased. Things changed quite a bit with the introduction of high-resolution sensors. This was particularly fruitful on cameras with a relatively low resolution, because the chance of seeing moiré patterns was quite high. By reducing the amount of detail of a scene, they were able to drastically reduce the chance of moiré pattern showing up in images. The Effect of Optical Low-Pass Filterįor many years, camera manufacturers have been dealing with moiré patterns by introducing a “blur” filter in the optical low-pass filter (which is a filter stack that sits in front of the image sensor). Once color information is added to the image from the bayer filter during the demosaicing process, additional rainbow-like patterns can appear on top of the image. Depending on the frequency and direction of the grids, it can show different patterns. Now here is what happens when the two grids are overlaid on top of each other:Ĭombining the two grids resulted in many new patterns, which is moiréĪs you can see, combining the first two grids and overlaying them on top of each other creates many new larger repeating square shapes – that’s essentially how moiré gets formed. Now let’s take a look at a curved grid, which I slightly tilted clock-wise: Curved grid ![]() Take a look at the simple square grid below, which is made to imitate how digital sensor pixels are overlaid on a grid: Straight grid, similar to one found on image sensors With two separate patterns overlaid on top of each other, a third, false pattern emerges in the form of “moiré pattern”. In photography, moiré happens when the item being photographed contains a detailed pattern that does not play along with the pattern of the imaging sensor. You might have even seen it on your television. Moiré is almost never seen in nature, but can be commonly found when photographing everyday objects – you might see it in all kinds of fabric (jackets, shirts, towels, and curtains), straight hair, architecture, etc. See the strange rainbow pattern on the left side of the image, as well as the wavy pattern visible on the right side? That’s moiré for you, at its worst.
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