Nikon D3S User Manual page 201

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Toning (Monochrome Only)
Pressing 3 when Toning is selected displays
saturation options. Press 4 or 2 to adjust
saturation. Saturation control is not available
when B&W (black-and-white) is selected.
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Custom Picture Controls
The options available with custom Picture Controls are the same as
those on which the custom Picture Control was based.
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