(User’s Manual: D300S page 70; D300 page 58)
JPEG compression allows you to further fine-tune the level of compression of your JPEG images. The JPEG format is always a compressed format. The Image quality settings for JPEG images include fine, normal, and basic. Each of these settings provides a certain level of compression of the file size.
As discussed previously, a JPEG fine file has a 1:4 compression ratio, while JPEG normal is 1:8, and JPEG basic is 1:16. A JPEG file is smaller in size than a RAW file or TIFF file—especially TIFF.
JPEG files will normally vary in size when the subject of one image is more complex than that of another. For instance, if you take a picture of a tree with lots of leaves and bark against a bright ...