Canon POWERSHOT S100 User Manual page 72

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The camera will shoot, even without pressing the shutter button, when it
detects a smile.
Choose L_.
Follow Steps 1 - 2 on p. 60 to choose _,
then press the "_" button.
Press the 4_' buttons ortum the O dial to
choose _, then press the @ button.
The camera will enter shooting stand-by,
and [Smile Detection on] wi[[ appear on the
screen.
Point the camera at a person.
Each time the camera detects a smile it will
shoot after the lamp lights.
Press the _ button to pause smile
detection. Press the _ button again to
resume smile detection.
Smiles are easier to detect if the subject faces the camera, and opens their mouth
enough to show some teeth when smiling.
After choosing ._ in Step 1, press the .,_v buttons.
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