Actually what I was referring to was the horrible pixellation. I'm also getting some pretty rotten FPS with this too.
So how do I get the clarity from this screen:
I only have access to twilight princess atm, but after playing with a few settings.
You need EFB Scaled copy enabled.
Enable EFB copy to Texture, gets rid of the horrid bloom effects and glitches it seems.
Although doesn't get rid of the ghosting and reflections that TP suffers from.
If you disabled EFB copy all together it corrects all these issues although top left half of my left screen just breaks.
Edit: I've just managed to try the Wii version rather than the GC version and the Bloom hack seems to fix the ghost effect. Although the reflections and the background ghosting doesn't get fixed, this looks like a transparency or AF problem to me. Similiar to the one in Dragon age with fire when eyefinity is enabled?
Result!: Disabling EFB all together on the Wii version fixes all these issues.
Edit: Also it seems that the widescreen hack can break some effects when it goes beyond the traditional AR.