Ok, ive now noticed that when u add the scanline effect, it seems to washout the colours, and the bightness or contrast doesnt seem to be as bright. I have tried changing the brightness, contrasts and gamma settings in mame, but cant get it anywhere near as it looks without the scanline effect on. Any ideas why this happens?. I know the scanline png has white and grey lines going down, would it make a difference if these white lines where not white and instead transparent??