Samsung UN65D8000XFXZA - Manual (Page 141)

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Background Color : You can change the background color of the caption.
Options include Default, White, Black, Red, Green, Blue, Yellow, Magenta and
Cyan. The default is Black.
Foreground Opacity : This adjusts the opacity of text. Options include Default,
Transparent, Translucent, Solid and Flashing.
Background Opacity : This adjusts the opacity of the caption background.
Options include Default, Transparent, Translucent, Solid and Flashing.
Return to Default : This option sets each Size, Font Style, Foreground Color,
Background Color, Foreground Opacity and Background Opacity to their
default.