Nikon D810 - Manual (Page 427)

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5
Save the resized copies.
A confirmation dialog will be
displayed. Highlight Yes and press J
to save the resized copies.
A
Viewing Resized Copies
Playback zoom may not be available when resized copies are
displayed.
A Image Quality
Copies created from NEF (RAW), NEF (RAW) + JPEG, or TIFF (RGB)
photos have an image quality (0 79) of JPEG fine; copies created from
JPEG photos have the same image quality as the original.