Advice on removing backgrounds?

[tommik128]

(09-16-2018, 10:43 PM)mholder Wrote: I usually duplicate the image layer, and then run either a Gmic stamp or posterize filter on it.

Thanks! This seems to be very effective way of how to clean the background grain in a scanned image. I was kinda struggling how to do this sort of "one color" cleanup without having to use any smoothing filters that also affect the foreground that I do not want to be changed... And of course avoiding the time consuming selection by hand.