Ricoh Caplio R6 - Manual (Page 59)

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Hold the DISP. button down to maximize the display brightness.
When the brightness is at the maximum setting, holding the DISP.
button down returns the brightness to the level set in [LCD
BRIGHTNESS] (GP.126).
When Histogram is on, a histogram
appears in the lower right corner on the
LCD monitor. A histogram is a graph
indicating the number of pixels on the
vertical axis and the brightness on the
horizontal axis (from left to right,
shadows (dark areas), midtones, and
highlights (bright areas)).
By using the histogram, you can determine the brightness of an
image without being affected by the brightness around the LCD
monitor. This also helps you correct for areas that are overly bright
or dark.
If the histogram has only peaks on the
right side without anything else, this
picture is over-exposed with too many
pixels only for highlight sections.
If the histogram has only peaks on the
left side without anything else, this
picture is under-exposed with too
many pixels only for shadow sections.
Correct the exposure to an appropriate
level.
Maximizing the LCD Monitor Brightness
Histogram