Using The Viewfinder - Canon PowerShot SD900 User Manual

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. 52).
Sample Histograms
Dark Image
Balanced Image Bright Image
18
, Using the Viewfinder
The viewfinder can be used to conserve power by turning the LCD
monitor off (p. 12) while shooting.