Nikon D300 User Manual (en)

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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.
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.
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.