User`s guide

5-34 Microtek ScanWizard 5 User's Guide (Macintosh)
Palette:
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 spec-
trum that appears in the image.
Dither:
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.
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 Adap-
tive palette with Diffusion. If the 256 Colors
(Custom) option is selected, the dialog box
below appears.