Nikon D800 - Manual (Page 250)

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Playback Zoom
To zoom in on the photograph when the
histogram is displayed, press
X. Use the X and
W buttons to zoom in and out and scroll the
image with the multi selector. The histogram will
be updated to show only the data for the portion
of the image visible in the monitor.
A
Histograms
Camera histograms are intended as a guide only and may differ from
those displayed in imaging applications. Some sample histograms are
shown below:
If the image contains objects with a
wide range of brightnesses, the
distribution of tones will be relatively
even.
If the image is dark, tone distribution
will be shifted to the left.
If the image is bright, tone
distribution will be shifted to the
right.
Increasing exposure compensation shifts the distribution of tones to
the right, while decreasing exposure compensation shifts the
distribution to the left. Histograms can provide a rough idea of overall
exposure when bright ambient lighting makes it difficult to see
photographs in the monitor.