Nikon D810 - Manual (Page 436)

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Save the edited copy.
Press J to save the retouched copy.
Compare retouched copies to the original photographs. This
option is only available if the b button is pressed to display the
retouch menu when a copy or original is played back full frame.
1
Select a picture.
Select a retouched copy (shown by a
N icon) or a photograph that has
been retouched in full-frame
playback and press b.
2
Select
Side-by-side comparison.
Highlight Side-by-side comparison
and press J.
Side-by-Side Comparison
b
button