Nikon D300 User Manual page 144

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NEF (RAW) Lossless compressed

NEF (RAW) Uncompressed

NEF (RAW) Compressed

▪ NEF (RAW) Lossless Compressed – The factory

default for the

compression will not affect image quality since it's a

percent—with no image data loss—it's my favorite

compression method to use. It works somewhat like a

ZIP file on your computer—it compresses the file but

allows you to use it later with all the data still available.

▪ NEF (RAW) Compressed –

generation of cameras, including the D300(S), this mode

was known as "visually lossless". The image is

compressed and the size is reduced by 40 to 55 percent,

depending on the amount of detail in the image. There is

a small amount of data loss involved in this compression

method. Most people won't be able to see the loss since

it doesn't affect the image visually. I've never really

seen any loss in my images using this method. However,

I've read that some have noticed slightly less highlight

detail. Nikon says that this is a non-reversible

compression, so once you've taken an image using this

mode, any small amount of data loss is permanent. If this

concerns you, then use the

discussed above. It won't compress the image quite as

shrinks the stored file size by 20 to 40

(20–40% size reduction)

(No compression – full file size)

(40–55% size reduction)

Before the newest

Lossless compressed

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