What do you mean? I don't use any filtering or anything - just nice big chunky pixels!! As I said before I don't see the point in scanlines on VGA monitors - it just makes the picture darker and unrealistic IMO - I don't see them as a thing I want to see anyway. Playing MD games at 640x480 makes barely any difference than playing at 320x240, except I can set 640x480 to 120Hz for even less eye burnage. It won't let me make custom resolutions as low as the orginals, anyway - the lowest I can get is like 512x448 @ 120Hz (NES and a good few arcade boards).
I agree that 640x480 won't look much different than 320x240 on a VGA monitor, but both look like ass compared to it's native, interlaced resolution. The scanlines do make the picture look darker (but you can adjust this usually) but they also make it look a LOT more natural. It's low-res simulation, and is about as close as you can get to the real thing on a non-interlaceable device.
Personally I'd rather "burn my eyes" than put up with artificial scanlines, I find them distracting and ugly. I don't see how this makes me a casual gamer (especially since I'd rather just play the games in question on my Megadrive).
I love scan lines on emulators. When I used a CRT monitor I didn't likre them that much but on the TFT they look very good. just use the 25% setting or "TV" mode. Full scan lines or 50% normally look crap on TFT. yakumo
So how do you get rid of them on the TV? My point is, scanlines make it look more like it's supposed to look. Low res graphics on a high res screen are worse than crack. And like Yakumo says, just set them down to like 25%, and they don't make the screen that dark. Only maybe... as dark as a normal Tube TV would.