If you see green or purple then that is a colour space issue.
If your picture now looks washed out, again, the colour space has changed. But that doesn’t necessarily mean that the new setting is wrong, it could mean that the previous setting was wrong and that you need to re-calibrate the brightness and contrast.
To check that you have the right colour space simply download the small mp4 file (7z or self extracting), it’s on the following AVSForum page: http://www.avsforum.com/avs-vb/showthread.php?t=948496
Play the flashing grey bars (on the black background) video. If you turn up the brightness on your display, then you should be able to see flashing bars across the entire screen. If you can only see 4 or 5 flashing bar then your signal is being clipped and you have the wrong colour space setting.
