Nikon D810 - Manual (Page 415)

391
A
Trim: Image Quality and Size
Copies created from NEF (RAW), NEF
(RAW) + JPEG, or TIFF (RGB) photos have an
image quality (0 79) of JPEG fine; cropped
copies created from JPEG photos have the
same image quality as the original. The size
of the copy varies with crop size and aspect
ratio and appears at upper left in the crop
display.
A
Viewing Cropped Copies
Playback zoom may not be available when cropped copies are
displayed.