Nikon D3200 Reference Manual page 58

Use the multi selector to create a copy with modified color
balance as shown below. The effect is displayed in the monitor
together with red, green, and blue histograms (_ 99) giving the
distribution of tones in the copy.
Increase amount of green
Increase amount of /'f_ Create retouched copy
blue -_,_ Increase amount of amber
Increase amount of magenta
Zoom
To zoom in on the image displayed in the monitor, press the
button. The histogram will be updated to show data only for the
portion of the image displayed in the monitor. While the image is
_I:L (o_) toggle back and forth zoomed in, press the button to
between color balance and zoom. When zoom is selected, you can
zoom in and out with the _ and q_ (?) buttons and scroll the image
with the multi selector.
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