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FIRST-TIME USER? READ THIS.
Tip: The Histogram
The histogram is a graph showing the distribution of pixels of dif-
ferent brightness in the image. Brightness is plotted on the hori-
zontal axis, with shadows at the left and highlights at the right.
The vertical axis gives the number of pixels. The histogram can be
used to assess exposure and check for loss of detail in highlights
and shadows without the brightness of your surroundings affect-
ing your judgement. A histogram in which pixels are clustered on
the right indicates that the image may be overexposed, while a
histogram in which pixels are clustered on the left indicates that
the image may be underexposed.
Overexposed Underexposed
If the image appears to be incorrectly exposed, you may be able
to use exposure compensation to correct exposure in subsequent
photographs of the same subject (page 77; note that exposure
compensation may be insufficient to produce the correct expo-
sure in some cases). The histogram can also be used as a guide
when adjusting contrast in photographs after shooting (pages
101, 102).
The histogram is intended as a guide only and may not be com-
pletely accurate, particularly in cases in which the flash is used or
ambient lighting is poor.