Pentax Optio A10 Operating Manual page 53

Using Histogram
A histogram is a graph showing the
brightness of an image on the
horizontal axis and the number of
pixels on the vertical axis (distribution
chart of the brightness). The histogram
will help you detect the brightness of
the image you have taken. For
instance, the graph peak tends to
Brightness
appear on the left side for a darker
(Dark) (Bright)
image, and the graph peak tends to
appear on the right side for a brighter
image. In general, when the exposure meter of your image is well-
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balanced, the graph peaks tend to appear in the middle. On the contrary,
when the exposure meter gets imbalanced tending dark and bright
without showing a neutral brightness, the peaks appear not in the middle
but on both sides.
Dark Neutral Bright
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