Canon PowerShot A590 IS User Manual page 50

Information for images shot on other cameras may not display
correctly.
Histogram Function
The histogram is a graph that allows you to check the brightness of
an 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. By using the exposure compensation function, you can
correct the image brightness before shooting (p. 99).
Sample Histograms
Dark Image
Shooting Mode
Balanced Image Bright Image
Item Options
Reference
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