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Sometimes when we push the ISO high on an image, one of the byproducts of doing that is that we get a little bit of image noise. And we have a tool in Aperture to help us reduce that Noise. It won't get rid of it, but we can downplay it a little bit, and I want to show you how it works. So, we'll work with this shot right here. And in the Metadata, as you'll see, it was shot at ISO 1600. So, you can guess that there will probably be some Noise, especially in the shadow areas of this image.
So, let's take a look at it. I'm going to hit the V key here, hit the V key again, and already we can see some Noise in here, but I'm going to hit the Z key, so we can zoom on in. And we have especially Chromatic Noise here, where we have some color artifacts in there. So, what we can do is go to our Adjustments pop-up window, and go to Noise Reduction, and we basically have two settings. We have a Radius setting, like in our other corrections, determines the area from the pixel that's going to be affected, and then Edge Detail.
And we're always sort of walking the compromise. If we want to maintain a lot of Edge Detail, then there is going to be some tradeoff on the amount of reduction that takes place, so let me show you how that works. So, we'll just watch this area here, and I'll go ahead and up the Radius all the way, and then we'll pull the Edge Detail down. And you can see that the image definitely gets softer. Let's turn it off and on. So, the Noise itself is reduced, but at the same time, we've lost just some overall edge sharpness too.
I am going to hold down the Spacebar and move. So, let's take a look how this is affecting our image. See? If we look at the difference - I mean when we go to extremes like this, we're losing a lot of detail in our image, and this might be a case where the Noise is actually better than the loss of detail. But that doesn't mean we can't find a happy medium here. Let's bring our Edge Detail up, and bring our Radius down a little bit. Now we might not be getting quite as much reduction in the Noise, but overall, our picture has been harmed less.
Let's turn that off and on. So, here the Noise comes back pretty strong with it off, but we are getting some reduction in Noise but not at the sake of the whole picture. And I think that's what you want to strive for when you work with Noise Reduction. Understand that you are not going to completely eliminate Noise with this tool. There are other third-party tools out there that are just dedicated to working on this, so that you can probably get stronger reduction with.
But it does help you downplay a little bit. Just keep in mind that you don't want to sacrifice the rest of your image in order to reduce the Noise. So, find that happy medium by working these two sliders, and see what you can do.
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