User`s guide

E-4 Microtek ScanWizard 5
Image Types
For a computer to represent image information in a digital format, the computer
uses units of picture elements, or pixels.
An image file, for instance, is simply a representation of hundreds, thousands, or
even millions of pixels arranged in a grid, and computers record the intensity
and color of a pixel in 1 or more bits of data. The greater the number of bits, or
bit-depth, of an image, the more information it can store. For easy classification,
images can be categorized into single-bit, grayscale, or color.
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 images, 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.
Line Art Error Diffusion