Nikon COOLPIX S6400 Reference Manual page 88

Option
G AF area mode
e Skin softening
y Blink proof
a Smile timer
C
Camera Settings That Cannot Be Used Simultaneously
Some settings cannot be used with other functions (A71).
70
Allows you to determine how the camera selects the focus area
that is used for autofocus; the available settings are Center
(default setting) and Target finding AF (A74).
Allows you select the degree of the skin softening effect. When a
setting other than Off is selected, the camera softens skin tones
by applying the skin softening function before saving images. The
default setting is Normal.
When On is selected, the camera automatically releases the
shutter twice each time a picture is taken. Of the two shots, one in
which the subject's eyes are open is saved. The flash cannot be
used.
The default setting is Off.
When On (default setting) is selected, the camera detects human
faces and then automatically releases the shutter whenever a
smile is detected. Self-timer cannot be used with this feature.
Description
A
E66
E67
E68
E68