Canon EOS REBEL T1 i/EOS 500D Instruction Manual page 43

Basic Shooting and
Image Playback
This chapter explains how to use the Basic Zone modes
on the Mode Dial for best results and how to playback
Images.
With the Basic Zone modes, all you do is point and shoot and
the camera sets everything automatically (p.198). Also, to
prevent botched pictures due to mistaken operations, major
shooting settings cannot be changed in the Basic Zone modes.
The settings (functions set automatically) which cannot be set
by the user are grayed out.
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About the Auto Lighting Optimizer
In the Basic Zone modes, the Auto Lighting Optimizer will adjust the
image automatically to obtain the optimum brightness and contrast.
It is also enabled by default in the Creative Zone modes (p.186).