It's time to access the "Reduce Noise" filter. I'll go to the "Filter" menu, scroll down to "Noise" and slide over and down to "Reduce Noise".



A dialog box, like below, pops up with a bunch of sliders and options.



The "Strength" slider controls the amount of noise reduction. This image has a lot of noise, so I'm going to drag the "Strength" slider almost all the way over to the right. Unfortunately, there is a trade off between noise reduction and image quality. The more you reduce noise, the more you reduce the details, so it's important to find the right balance. The "Preserve Details" slider helps to control the amount of details you want to "preserve", like the name says. Unfortunately, it can leave more noise in the image than you want. I am going to slide it all the way to the left, to preserve no details. A low "Preserve Details" setting along with a high "Strength" setting will remove the most noise.


You can see in the "Preview" area that there is much less noise than before. I'll left-click in the "Preview" area and hold down the button to see the image without the filter and let it go to return to the preview of what the image will look like with the current filter settings. There are some other controls here that aren't as important as "Strength" and "Preserve Details". "Reduce Color Noise" reduces the color noise. I'll set it at 45%. "Sharpen Details" sharpens the details. I don't want to do that, so I'll set it to 0%.