Ricoh WG-20 Operating Manual page 33

Understanding Brightness
If the brightness is correct, the graph peaks in the middle. If the image
is underexposed, the peak is on the left side, and if it is overexposed,
the peak is on the right side.
Dark image Correct image Bright image
When the image is underexposed, the part to the left is cut off
(dark portions) and when the image is overexposed, the part to the right
is cut off (bright portions).
This camera has a function where overexposed areas are indicated
as blinking red and underexposed areas as blinking yellow.
Understanding Contrast
The graph peaks gradually for images in which contrast is balanced.
The graph peaks on both sides but sinks in the middle for images with
a large difference in contrast and low amounts of mid-level brightness.
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