Nikon D750 DSLR Camera (Body Only) - Manual (Page 431)

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Image overlay combines two existing NEF (RAW) photographs to
create a single picture that is saved separately from the originals;
the results, which make use of RAW data from the camera image
sensor, are noticeably better than overlays created in an imaging
application. The new picture is saved at current image quality
and size settings; before creating an overlay, set image quality
and size (
0 115, 118; all options are available). To create a NEF
(RAW) copy, choose an image quality of NEF (RAW) .
1
Select Image overlay .
Highlight Image overlay in the
retouch menu and press 2 . The
dialog shown at right will be
displayed, with
Image 1 highlighted;
press J to display a picture selection
dialog listing only NEF (RAW) images
created with this camera.
Image Overlay
G button
➜
N retouch menu
+