There are two ways people around here talk about to "denoise" an image (aside from image editing softwares like PS, GIMP.. etc.), the native Daz3d Denoiser that works in parallel with the rendering process and a small program that uses an external command code that you can use after rendering an image.
Each of these two have their ups and downs, the Daz3d Denoiser works great the longer you keep your image rendering, it's a slow process but in the end it gives you a decent look especially for those images where the well-lit areas look sharp and nice and the darker areas are noisy. The process though does add to your render time and your results will vary depending on how bad/good the image lighting / noisy areas are.
On the other hand you have a small external program by a Declan Russel that analyses an image for noise after you render it and then it does its thing and how long that takes depends on the amount of noise found in the processed image. The results here are usually very good and it doesn't overstep on the image and tends not to smear things around like the one in daz, in most cases it keeps things sharp and tidy. The thing is an average user stays away from it because it doesn't have a user interface and it handles things via command codes. HOWEVER, some dude over at the Daz3d forums did a small tutorial on how to add it as right clickable option, you can even use it on multiple files, just highlight, right click and let it do its thing! It does however require you to do a windows registry edit to set it up.
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. The right-click things should be somewhere at the end of the page.
Have fun and I hope you find this useful
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