Pretty new/totally noob about Retropie, I just switch from Hyperspin to Retropie for the simplicity to use it. My only regret so far, is the possibility to use Blargg’s NTSC Libraries.
What is Blargg’s NTSC filter? See the picture below: it’s probably the best shader so far on a Nes/Snes/Genesis system. I can’t find something similar in Retropie. Perhaps I’m mistaken, but I can’t find something similar in the shader folder.