Nikon D90 - Manual (Page 82)

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Image Quality
The camera supports the following image quality options (listed in descending order
by image quality and file size):
Image quality can be set by pressing the X (QUAL) button and rotating the main
command dial until the desired setting is displayed in the control panel. Image
quality can also be adjusted from the shooting menu (pg. 165).
A NEF (RAW) Images
Note that the option selected for image size does not affect the size of NEF (RAW) images.
When opened in software such as Capture NX 2 (available separately) or ViewNX (supplied),
NEF (RAW) images have the dimensions given for large (L-size) images.
A NEF (RAW)/NEF+JPEG
When photographs taken at NEF (RAW) + JPEG Fine, NEF (RAW) + JPEG Normal, or NEF
(RAW) + JPEG Basic are viewed on the camera, only the JPEG image will be displayed. When
photographs taken at these settings are deleted, both NEF and JPEG images will be deleted.
White balance bracketing (pg. 191) is not available when an NEF (RAW) + JPEG option is
selected for image quality. Selecting an NEF (RAW) + JPEG option cancels white balance
bracketing.
Option File type Description
NEF (RAW) NEF
Raw 12-bit data from the image sensor are saved directly to the memory
card. Choose for images that will be processed on a computer. JPEG
copies of NEF (RAW) images can be created using the NEF (RAW)
processing option in the retouch menu (pg. 220) or software such as
ViewNX (supplied) or Capture NX 2 (available separately; pg. 240).
JPEG fine
JPEG
Record JPEG images at a compression ratio of roughly 1 : 4 (fine image
quality).
JPEG normal
(default)
Record JPEG images at a compression ratio of roughly 1 : 8 (normal
image quality).
JPEG basic
Record JPEG images at a compression ratio of roughly 1 : 16 (basic image
quality).
NEF (RAW) +
JPEG fine
NEF/
JPEG
Two images are recorded: one NEF (RAW) image and one fine-quality
JPEG image.
NEF (RAW) +
JPEG normal
Two images are recorded: one NEF (RAW) image and one normal-quality
JPEG image.
NEF (RAW) +
JPEG basic
Two images are recorded: one NEF (RAW) image and one basic-quality
JPEG image.
X (QUAL) button Main command dial Control panel