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This has nothing to do with jpeg artifacts.

Jpeg artifacts look like in my attachment.

Let me make one thing clear; Photoshop can't do what Neatimage can....period. What ever tricks you use; it's impossible.

Sad, but it's the truth. I can even proof it with every noisy picture  Neatimage is based on a totally different approach.

Mindbender already posted all the information you need to do it in Photoshop.

I never use Photoshop to remove noise like this; you might be able to remove the noise, but you will also lose a lot of details.