Canon POWERSHOT S100 User Manual page 80

You can choose the settings for various functions to suit your preferences.
AE stands for Auto Exposure.
The focusing range is approximately 5 cm (2.0 in.)- infinity at maximum wide
angle (l_]), and approximately 30 cm (12 in.) - infinity at maximum telephoto
(E_]).
Enter P mode.
Set the mode dial to P.
Adjust the settings according to
your purposes (pp. 81 - 115).
shoot.
If a correct exposure cannot be obtained when pressing the shutter button
halfway, the shutter speed and aperture value appear in orange. Try the following
settings to obtain the correct exposure.
Turn on the flash (p. 81 )
Choose a higher ISO speed (p. 85)
8O