Nikon D300 - Manual (Page 84)

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❚❚The JPEG Compression Menu
The [JPEG compression] item in the shooting menu offers the
following options for JPEG images:
❚❚The NEF (RAW) Recording Menu: Type
The [NEF (RAW) recording] > [Type] item in the shooting menu
offers the following compression options for NEF (RAW) images:
Option Description
O
Size priority
(default)
Images are compressed to produce relatively
uniform file size.
Quality varies with scene
recorded.
P Optimal quality
Optimal image quality. File size varies with
scene recorded.
Option Description
N
Lossless
compressed
(default) NEF images are compressed using a reversible
algorithm, reducing file size by about 20–40%
with no effect on image quality.
O Compressed
NEF images are compressed using a non-
reversible algorithm, reducing file size by about
40–55% with almost no effect on image quality.
Uncompressed NEF images are not compressed.