Samsung UN65D8000XFXZA - Manual (Page 46)

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Pattern2 : This test screen demonstrates the effect of the display settings on
colors.
N
After selecting Pattern1 or Pattern2 , you can adjust any of the advanced
settings for desired effect.
N
While the Expert Pattern is running, the TV does not output sound.
N
Only enabled in DTV, Component, and HDMI modes.
● RGB Only Mode (Off / Red / Green / Blue) : Displays the Red, Green and
Blue colors so you can make fine adjustments to hue and saturation.