Nikon D3400 Kit Owner's Manual

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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.