Canon PowerShot SX400 IS User Manual page 130

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Overexposure Warning (for Image Highlights)
Washed-out highlights in the image flash on the screen in detailed
information display ( = 129).
Histogram
Still Images
Still Images
●
The graph in detailed information
display ( = 129) is a histogram
showing the distribution of
brightness in the image. The
horizontal axis represents the
degree of brightness, and the
vertical axis, how much of
the image is at each level of
brightness. Viewing the histogram
is a way to check exposure.
130
Movies
Movies