It is everywhere. All digital cameras produce it. Some more and some less. Furthermore any post processing we do is just making things worse. A lot worse.
I use Paint Shop Pro for my PP and it has a wonderful NR tool that i use AFTER all the other changes i make (exposure, sharpening e.c.t.). Since now it's working fine (depending on the original noise of the pic) but it is wise? Is it better to apply the NR filter to another stage of the PP?