Nikon D90 - Manual (Page 81)

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Image Quality and Size
Together, image quality and size determine how much space each photograph
occupies on the memory card. Larger, higher quality images can be printed at larger
sizes but also require more memory, meaning that fewer such images can be stored
on the memory card.
Changes to image quality and size are reflected in the number of exposures
remaining as displayed in the control panel and viewfinder (pg. 35).
A File Names
Photographs are stored as image files with names of the form “DSC_nnnn.xxx,” where nnnn is a
four-digit number between 0001 and 9999 assigned automatically in ascending order by the
camera, and xxx is one of the following three letter extensions: “NEF” for NEF images or “JPG”
for JPEG images. The NEF and JPEG files recorded at a setting of “NEF+JPEG” have the same file
names but different extensions. Small copies created with the small picture option in the
retouch menu have file names beginning with “SSC_” and ending with the extension “.JPG”
(e.g., “SSC_0001.JPG”), while images recorded with the other options in the retouch menu have
file names beginning with “CSC” (e.g., “CSC_0001. JPG”). Images recorded at a Shooting menu
> Color space > Adobe RGB (pg. 167) have names that begin with an underscore (e.g.,
“_DSC0001.JPG”).
Image Quality and Size
Large file size
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JPEG fine
JPEG normal
JPEG basic
Small file size S
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Small<Image size >Large