@lukePi-0 you shouldn't be adjusting the retroarch video driver in this circumstance. info on HW rendering in duckstation are here: https://retropie.org.uk/forum/topic/30743/lr-duckstation-experimental-new-playstation-1-emulator - you cannot use duckstation HW rendering on a pi3
i believe lr-pcsx_rearmed has a core option to remove dithering.