Nikon D5 - Manual (Page 342)

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Image Overlay
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 photographs combined 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 92, 95; all options are available). To create a
NEF (RAW) copy, choose an image quality of NEF (RAW) and an
image size of Large (the overlay will be saved as a large NEF/RAW
image even if Small or Medium is selected).
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 large NEF
(RAW) images created with this camera (small and medium
NEF/RAW images can not be selected).
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