Microtek ScanMaker i700 User Manual page 97

Basic Scanning Concepts
RGB
GrayScale
Single-bit
Single-bit images are the simplest kind, using just one bit of data to record
each pixel. Single-bit images come in two types: line art, and error
diffusion.
Line Art includes anything that is black and white, such as a pencil or
ink sketch. Line Art may also include one-color image, such as
mechanical blueprints or drawings.
Error Diffusion reproduction of images that gives the illusion of gray
but only because the black and white dots (or pixels) comprising the
image are arranged in such a way as to fool the eye to see gray. This
is because when Error Diffusion is printed, dark areas are represented
by darker dots coming together, while lighter areas are those with
scattered dots. An example of halftone images would be the pictures
you see in a newspaper or magazine.
Grayscale
Grayscale images contain more than just black and white, and include
actual shades of gray. In a grayscale image, each pixel has more bits of
information encoded in it, allowing more shades to be recorded and shown.
For instance, four bits are needed to reproduce up to 16 levels of gray.
Going higher, eight bits can reproduce the 256 levels of gray required to
represent most black-and-white photos accurately.
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RGB-R
Indexed
RGB-G
Lab1
RGB-B
Lab2