V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 159
available. See the separate
Introduction to Nikon Software
eBook that accompanied this eBook for more discussion of
the software used for conversions.
NEF files are larger than JPEGs:
Typical D300 File Sizes
Format
Large
Medium
Small
JPEG FINE
5.8MB
3.3MB
1.5MB
JPEG NORM
2.9MB 1.6MB
700KB
JPEG BASIC
1.5MB
800KB 400KB
14-bit
12-bit
Uncompressed NEF
25.3MB
19.4MB
Lossless Compressed NEF
16.7MB 13.6MB
Compressed NEF
14.2MB
11.3MB
For NEF+JPEG just add the appropriate NEF and JPEG figures
together. File sizes are approximate due to compression effects and
also sector size differences. The numbers reported above are
Nikon’s. In practice, I find Compressed NEFs actually tend to be a
bit smaller than Nikon’s numbers.
Compressed NEFs
The D300 supports two types of compressed NEF files. One
version is said to be “lossless” (and labeled as such in the
camera), while the other is said by Nikon to be either
“virtually lossless” or “visually lossless,” meaning that results
visually indistinguishable from those that would be produced
by the original data can be recovered.
Lossless compressed NEF
truly lossless
Compressed NEF
visually lossless
“Visually lossless” isn’t quite the same thing as “lossless.” In
the truly lossless version the original data is recovered exactly
when the data is later uncompressed, so we don’t have to
worry about or discuss further what happens with the data in
the
Lossless compressed NEF
option.