Oki S900 - Manual (Page 31)

USING THE S900 AS A SCANNER > 31
8-BIT GRAY
A single-channel image consists of at least 256 shades of gray. An 8-
bit scanner produces a greyscale image with 1024 shades of gray
between pure black and pure white. Choose this option if you are
scanning black and white photographs.
With 8 bits of color information per pixel, the file size of an image is
eight times larger than a black and white image and 1/3 the size of a
24-Bit Color image.
24-BIT COLOR
A 24-Bit Color image consists of three 8-bit color channels. The red,
green, and blue channels are mixed together to create a combination
of one billion colors which give a more true-to-life quality to the
image. Choose 24-Bit Color if you are scanning color photos.