I'm getting some blurring/ghosting in Twilight Princess (Gamecube). I've attached a couple of pics to show what I mean. I had this problem with the PCSX2 emulator too, and they said this it was an Nvidia problem (I have an Nvidia 970), but I never really found a fix. Is this normal with Dolphin and an Nvidia card too? I'm running the current stable release of Dolphin. I did download the latest development build, but it wouldn't allow me to use my current save states, and I'm already too far into the game to restart now.
It has nothing to do with your brand of GPU. This game has a bloom effect that does not work well when you increase the internal resolution. It's been that way for ages in Dolphin. Blame Nintendo.