Microtek ScanWizard EZ Reference Manual page 76

Black-and-White Diffusion
This is a single-bit black-and-white image dithered with error diffusion. The
black and white pixels are arranged in a way as to "fool" the eye into seeing gray .
256 Colors (Default)/256 Colors (Custom)
These are single-channel images (8 bits per pixel) that use a color lookup table
containing up to 256 colors. The file size is smaller for images in this mode. As
an initial setting, selecting 256 Colors (Default) uses an Adaptive palette with
Diffusion. If the 256 Colors (Custom) option is selected, the dialog box will
appear.
Palette:
Dither:
36 Microtek ScanWizard EZ - Professional Mode Reference Manual
The Palette option lets you choose the method for creating the
color palette table. Uniform uses a 6-6-6 fixed color palette table.
Adaptive (default) creates a color palette table from the more
commonly used areas of the color spectrum that appears in the
image.
The Dither option can improve the color quality of the 256-
indexed color image for photographs or continuous-tone images,
using a technique of mixing available colors to simulate missing
colors. None provides no dithering. Pattern uses a structured
pattern to simulate missing colors. Diffusion (default) uses the
error diffusion technique to dither colors and produces the best
quality for 256 colors.