Nikon D810 - Manual (Page 411)

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D
Small NEF (RAW) + JPEG Images
If the JPEG copies of small NEF (RAW) images taken at image quality
settings of NEF (RAW) + JPEG are recorded to the same memory card
(0 86), neither the NEF (RAW) images nor the JPEG copies can be
edited.
D
Retouching Copies
Most options can be applied to copies created using other retouch
options, although with the exceptions of Image overlay and
Edit movie > Choose start/end point each option can be applied
only once (note that multiple edits may result in loss of detail). Options
that can not be applied to the current image can not be selected.
A Image Quality
Except in the case of copies created with Trim, Image overlay, NEF
(RAW) processing, and Resize, copies created from JPEG images are
the same size and quality as the original, copies created from NEF
(RAW) photos are saved as large fine-quality JPEG images, and copies
created from TIFF (RGB) photos are saved as fine-quality JPEG images
of the same size as the original. Size-priority compression is used
when copies are saved in JPEG format.