Nikon D780 Reference Manual page 409

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[Side-by-Side Comparison]
Choose [Side-by-side comparison] to compare retouched copies with
the unretouched originals.
•
The source image is displayed on the left, the retouched copy on the
right.
•
The options used to create the copy are listed at the top of the display.
•
Press 4 or 2 to switch between the source image and the retouched
copy.
•
If the copy was created from multiple source images using [Image
overlay], press 1 or 3 to view the other images.
•
If the source has been copied multiple times, press 1 or 3 to view the
other copies.
•
To view the highlighted picture full screen, press and hold the X ( T )
button.
•
Press J to return to playback with the highlighted image displayed full-
frame.
•
To exit to playback, press the K button.
•
The source image will not be displayed if the copy was created from a
photograph that is now protected.
•
The source image will not be displayed if the copy was created from a
photograph that has since been deleted.
Options used to create copy
1
Source image
2
Retouched copy
3
Playback
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