Canon PowerShot A550 User Manual page 54

Histogram Function
The histogram is a graph that allows you to jUdge the brightness
of the image. The greater the bias toward the left in the graph, the
darker the image. The greater the bias toward the right, the
brighter the image.
If the image is too dark, adjust the exposure compensation to a
positive value. Similarly, adjust the exposure compensation to a
negative value if the image is too bright (p. 44).
Sample Histograms
Dark Image
Balanced Image
Bright Image
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Using the Viewfinder
The viewfinder (Basic Guide p. 2) can be used to conserve power
by turning the LCD monitor off (p. 12) while shooting.
- - + - Shows the center of the image
Viewfinder