Why is my samsung monitor quality is so poor after the lastest os update?

I recently updated my mac pro and the monitor qulity just turned very poor on me
all the options seems to be gone now
the text qulity is very poor
and the colour is also very poor.
everything was fine before the update what happened?

Hi julianju,
If you are having issues with the image quality on your external display after a recent OS update, you may find the following article helpful:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Regards,
- Brenden

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