Samsung UN55EH6070F E-Manual page 110

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Digital Caption Options
Default and Service1 ~ Service6
The availability of captions depends on the program being broadcast.
The Default setting follows the standards set by the broadcaster.
You cannot set the Foreground and Background to the same color.
You cannot set both the
to Transparent.
are available only when you can select
in Caption
and the
Font Opacity
English
Mode.
Background Opacity
▶