colour bleeding with snes9x & magic engine

[spottydog]

Hello, snes9x looks brilliant on my cab but there is a colour bleeding problem. I can't find a gamma correction setting for snes9x.
If I adjust the brightness monitor pot, the bleeding stops but the screen is too dark.
Magic Engine also has colour bleeding and is quite blurry. I found the gamma & brightness settings but adjusting them hasn't stopped the bleeding.
If I play bomberman, for example, there is bleeding and blurriness, but when I press escape, the image becomes very sharp and the bleeding stops. But when I return to the game, the problems reappear. How can I keep the sharp display?