Nikon D850 Menu Manual page 213

4
Compare the copy with the original.
The source image is displayed on the left, the retouched copy
on the right, with the options used to create the copy listed at
the top of the display. Press 4 or 2 to switch between the
source image and the retouched copy. To view the
highlighted picture full frame, press and hold the X button. If
the copy was created from two source images using Image
overlay, or if the source has been copied multiple times,
press 1 or 3 to view the other source image. To exit to
playback, press the K button, or press J to exit to playback
with the highlighted image selected.
D
Side-by-Side Comparison
The source image will not be displayed if the copy was created from a
photograph that was protected or has since been deleted or hidden
(0 21).
Options used to create copy
Source image Retouched copy
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