When you shoot in low light, it's very easy to get noise in the image. This is because the camera adjusts the sensitivity to really get to a proper exposure when there's not a lot of light. The more you boost the camera, the more you'll see noise in the digital image. Now, this photo looks great, but if I zoom in to 200%, you start to see some of the noise, particularly in the shadowy areas. Notice all of this aberration here in the glass. I'll go over to the Adjust tab, and start to pull the De-noise Slider over, and notice how it takes that out.
Now, if you overdo it, your image is going to start to look milky. As you see here, it's too much. So, I'm going to back that off a bit, and put a little bit of Sharpness back in after I pull out the noise. So if we look in some of those areas now, Shift key for before, and after. Let's go to 200%; you'll really see that. Before, after; a lot of the distracting noise has been removed.
Now, you'll really see this particularly in areas of skin tone. In this case, we have a little bit of blemishes in the photo. Pulling out some of the noise will smooth out the skin tone there, and if you look at the before, and the after, you could see the noise there in the shadowy area of the temple, and then taking it out. But remember, if you do use De-noise, be sure to follow up with a little bit of sharpening to balance out the image.
And if you look at the original, and the new one, you might be wondering what happened. It's extremely difficult to judge sharpness and noise unless you zoom to 100%. This is why you'll want to use that Npanel there, so you can see what's happening. Before the adjustment; after. A lot of the details have been smoothed over. Remember, adjusting Sharpness and De-noise can have an impact on how crisp the photo is, so you'll want to be careful as you tweak.
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