Did you install the 2.81 master build from this page? Then use the Denoise node in the compositor on your rendered image, as shown in several node setups in this discussion.
But maybe I don’t understand your question correctly.
Did you install the 2.81 master build from this page? Then use the Denoise node in the compositor on your rendered image, as shown in several node setups in this discussion.
But maybe I don’t understand your question correctly.