Samsung UN55ES8000G E-Manual page 701

and video source, make sure you
have connected the blue Pb jack on
the video source to the blue Pb jack
on the TV, the red Pr on the video
source to the red Pr jack on the TV,
and the green Y jack on the source
to the green Y jack on the TV.
Screen Brightness
If you find that the colors on your
Samsung TV are correct but just a little