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Another way that we can use the Noise Reduction filter is by tapping into the advanced controls which allow us to reduce noise on a channel-by-channel basis. Before we go to the filter, first let's take a look at the channels for this photograph here. This picture I was shooting with a really high ISO and so when we click into the Channels, we're going to see different noise amount. In the Red channel, it's almost like it's out of control compare that, say, to the Green or the Blue. Well, now that we've looked at this, what we can then do is go back to the RGB composite view and go to the Layers panel and then apply some noise reduction.
Let's do this, this time by simply copying this layer, press Command+J or Ctrl+J to do that and let's go ahead and name this layer noise. Next, we'll navigate to that Filter pull-down menu, here we are going to select Noise and then we'll choose Reduce Noise. This will open up our Noise Reduction dialog. And what's interesting about this is by default, just the basic controls are turned on. Click on Advanced and you'll see you now have this new tab. And if we click into this tab, we can then go into these various channels.
Here in the Red channel as I've mentioned before, we have a lot of noise. So what you can do is click and drag around and then increase the noise reduction in this channel. We can also choose to control the overall Detail amount. And by doing that, by cranking up how we're reducing noise in this channel, well, it's going to give us an overall better result. We can go onto those other channels as well and increase that just a little bit there and control the Green and also the Blue. Now it's sometimes a little bit tricky to try to figure out how far to go with all of these different channels.
That's why I like to navigate to the Channels panel before I get to this location. Perhaps most importantly, you want to go to the channel and really click and drag on it. That will show you the before and after of the noise. If you still see the noise being a problem, well, crank this up until you can see that it's starting to correct those problems. After you've dialed in those Advanced settings in the Overall settings, you can also control how far it's going to then remove all of this noise. In this case, with this image, I need to crank these values up a little bit more and then go ahead and click OK.
Now here we've the before and after and let me zoom in on this image so that we can see that. Here it is, our before with lots of color noise in the background and all over the place. And then now if we click on the icon again, we get the after. This image is really cleaned up and it looks a ton better. So whether we've noise on our image because it's noise in the shadows or if we've used a high ISO like I was using here, we can use these controls on a channel-by-channel basis in order to more effectively reduce or remove the noise.
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