Samsung PN51F4500AF User Manual page 38

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NOTE
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Digital Caption Options are available only when you can select
Default and Service1 ~ Service6 in Caption
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 Font Opacity and the Background
to Transparent.
English
Mode.
Opacity
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