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When you shoot with a digital camera it's inevitable that you will get some noise in your photographs. That is most likely to happen when you are shooting with a high ISO or when there are a lot of shadow areas in your photograph. So if I were to zoom into this image called jan.jpg from the 09_08_noise sub folder in the Chapter 09 exercise files. You can see lot of color digital noise right here, let me zoom back out and let's take a look at how we can reduce that kind of noise.
I'm going to the Filter menu at the top of the screen and from there I'm going down to the Noise menu and I'm going to choose Reduce Noise. That opens the Reduce Noise dialog box. I'm going to use the zoom symbols at the bottom of this box to get in little closer and I'll click and drag in the image to move it around to where the noise looks really bad to me. I'm going to zoom in a little more, there we go. Now I'm going to come over to the sliders and I'm going to start with all the sliders over to the left. So I can really see how bad the noise is without any correction. Now I'm going to take the Reduce Color Noise slider and drag to the right to increase the strength at which I'm going to try to reduce the color noise. You can already see that although there is still noise there, a lot of the color in that noise is now gone. Then I'm also going to take the Strength slider and move that to the right and that smoothes things out so that the non-color noise is reduced as well.
When you shoot JPEGs, you sometimes have another kind of artifact in your photos. That is attributable to that format. That isn't a problem here, so I'm not going to check the Remove JEPEG Artifact box. There is one more slider here and that is Preserve Details. That protects edges in the photograph from this noise reduction. But I'm going to drag that to the left because I'm not that interested in protecting any part of this photograph. Because this is a portrait, it probably will look better with a little bit of softening, which is what I'll get by dragging the Preserve Detail slider to the left. Let me move over and show you what I mean. The face just looks a little softer and you do not see all the lines and wrinkles.
Now I'm going to click OK and there is my photograph with noise reduction applied. If I want even more noise reduction, I can go back to the Filter menu and choose Reduce Noise from the top of the filter list. The last filter used always shows up at the top of this list. That doubles the effect. That maybe a little much, but it certainly looks better than the noisy image we started with. So if your photos suffer from digital noise, give the Noise Reduction filter a try.
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