I've had success with just scaling the image in PI to something larger and then being able to see the bad artifacts easier as i push the processing then a final step to rescale down to original size and i get more contrast and detail this way. do all this at a 64bit depth if possible to give you room to play with pushing the signal. I'm sure someone will say 64bit is useless if you're captured 8-16bit subs but hey i dont mind and my computer is happy.
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