Nikon D40 manual Image Quality, Image Size, Option Format Description, Image size Size pixels

Image Quality

Controls used

The camera supports the following image quality options (the first four are listed in descending order by image quality and file size):

Option	Format	Description
RAW	NEF	Compressed raw data from the image sensor are saved directly to memory card.
		Choose for images that will be retouched on a computer.
FINE		Images are compressed less than NORM, producing higher-quality images. Com-
		pression ratio: roughly 1:4.
	JPEG
NORM		Best choice in most situations. Compression ratio: roughly 1:8.
(default)
BASIC		Smaller file size suited to e-mail or the Web. Compression ratio: roughly 1:16.
RAW+B	NEF+JPEG	Two images are recorded: one NEF (RAW) image and one basic-quality JPEG
		image.

Image Size

Controls used

Image size is measured in pixels. The following options are available:

Image size	Size (pixels)	Approximate size when printed at 200 dpi
L (default)	3,008×2,000	38.2×25.4cm (15.0×10.0in.)
M	2,256×1,496	28.6×19.0cm (11.3×7.5in.)
S	1,504×1,000	19.1×12.7cm (7.5×5.0in.)

Note that the option selected for image size does not affect the size of NEF (RAW) images. When viewed on a computer, NEF images are 3,008×2,000 pixels in size.

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Reference: More on Photography (All Modes)/Image Quality and Size