Nikon D300s - Manual (Page 185)

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A 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.
A Custom Picture Controls
The options available with custom Picture Controls are the same as
those on which the custom Picture Control was based.